In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Ex Input:
Passage: The two main requirements of an anti-torque system are that it should prevent rotation of the sonde, and it should allow easy movement of the drill up and down the borehole.  Attempts have been made to design drills with counter-rotating components so that overall torque is minimized, but these have had limited success.  Five kinds of anti-torque systems have been devised for use with cable-suspended EM drills, though not all are in current use, and some drills have used a combination of more than one design.  The first drill to require an anti-torque system was used at Camp Century by CRREL in 1966; the drill incorporated a set of hinged friction blades that swung out from the sonde when the drill motor was started.  These were found to have very weak friction against the borehole wall, and were ineffective; the drill had to be controlled carefully to prevent twisting the cable.  No other drills have attempted to use this approach.For the next deployment of the drill leaf springs were installed, and this has proved to be a more durable design.  These are mounted vertically, with a curve outwards so that they are easily compressed by the borehole wall, and can slide up and down with the movement of the drill.  They pass easily through any areas of irregularity in the borehole, but the edges of the springs cut into the borehole wall and prevent rotation.  Leaf springs are very simple mechanically, with the additional benefit of being easy to adjust by changing the spacing between the end points.  They can be placed anywhere on the drill that does not rotate, so they do not add length to the sonde.  The shape is usually a fourth-order parabola, since this has been determined to provide the most even loading against the borehole wall.  Leaf springs have been found to be so effective that they can prevent rotation even in heavy drills running at full power.Skate antitorque systems have blades attached to vertical bars which are pushed against the borehole wall; the blades dig into the wall and provide the anti-torque.  Skates can be built with springs which allow them to keep the blades pressed against the wall in an irregular borehole, and to prevent problems in narrower parts of the borehole.  Although skates are a popular design for anti-torque and have been used with success, they have difficulty preventing rotation in firn and at boundaries between layers of different densities, and can cause problems when drilling with high torque.  When they fail, they act as reamers, removing chips from the wall which can fall to the drillbit and interfere with drilling.

Ex Output:
What acts as reamers when they fail?


Ex Input:
Passage: The book is partly autobiographical. It follows the adventures of a group of people – the narrator Laurie, the eccentric Dorothea ffoulkes-Corbett (otherwise Aunt Dot), her High Anglican clergyman friend Father Hugh Chantry-Pigg (who keeps his collection of sacred relics in his pockets) – travelling from Istanbul (or Constantinople as Fr. Chantry-Pigg would have it) to Trebizond. A Turkish feminist doctor attracted to Anglicanism acts as a foil to the main characters. 
On the way, they meet magicians, Turkish policemen and juvenile British travel-writers, and observe the BBC and Billy Graham on tour. Aunt Dot proposes to emancipate the women of Turkey by converting them to Anglicanism and popularising the bathing hat, while Laurie has more worldly preoccupations. Historical references (British Christianity since the Dissolution of the Monasteries, nineteenth-century travellers to the Ottoman Empire, the First World War, the Fourth Crusade, St. Paul's third missionary journey, Troy) abound. 
The geographical canvas is enlarged with the two senior characters eloping to the Soviet Union and the heroine meeting her lover in Turkey, and then her semi-estranged mother in Jerusalem. The final chapters raise multiple issues such as the souls of animals, and culminate in a fatal accident and its aftermath.
At another level the book, against its Anglo-Catholic backdrop, deals with the conflict between Laurie's attraction to Christianity and her adulterous love for a married man. This was a problem Macaulay had faced in her own life, having had an affair with the married novelist and former Roman Catholic priest Gerald O'Donovan (1871–1942) from 1920 until his death.
The book's opening sentence is,"Take my camel, dear", said my Aunt Dot, as she climbed down from this animal on her return from High Mass.

Ex Output:
What is the thing that Laurie narrates?


Ex Input:
Passage: "Erschallet, ihr Lieder" (literally: sound, you songs) is a festive concerto, marked Coro by Bach. Words and music are possibly based on an earlier lost secular Glückwunschkantate (congratulatory cantata). A printing of Franck's works contains a cantata for New Year's Day, Erschallet nun wieder, glückwünschende Lieder (Sound again, congratulating songs) that may have served as a model. The movement is in da capo form: the first section is repeated after a contrasting middle section. It is scored for three "choirs": one of trumpets, another of strings and bassoon, and a four-part chorus. The number three, symbolizing the Trinity, appears again in the 3/8 time signature and in the use of three trumpets. The first part opens with trumpet fanfares, alternating with flowing coloraturas in the strings. The voices enter as a third homophonic choir. They repeat the first measure of the fanfare motif on the word "Erschallet" (resound!), as the trumpets echo the motif. The voices repeat the motif from the second measure of the fanfare on "ihr Lieder", and the trumpets echo it again. The chorus repeats measures 3 and 4 on "erklinget, ihr Saiten", commanding the strings to play. As a culmination, the first syllable of "seligste Zeiten" (most blessed times) is held on a seventh chord (first in measure 53), during which the instruments play their motifs.In the middle section in A minor the trumpets rest while the other instruments play colla parte with the voices. Polyphonic imitation expands on the idea that God will prepare the souls to be his temples. The first sequence progresses from the lowest to the highest voice, with entrances after two or three measures. The highest voice begins the second sequence, and the other voices enter in closer succession, one or two measures apart. Gardiner interprets the polyphony as "conjuring before us the elegant tracery of those 'temples' which God promises to make of our souls". The first part is repeated as da capo.The movement is comparable to the opening of Tönet, ihr Pauken! Erschallet, Trompeten! BWV 214 (Resound, ye drums! Ring out, ye trumpets!) composed in 1733 on another text calling instruments to sound, which Bach later used with a different text to open his Christmas Oratorio. Bach used a festive scoring with three trumpets in triple meter in his 1733  Missa for the court in Dresden, in the Gloria, in  contrast to the preceding Kyrie.

Ex Output:

What repeats the first measure of the fanfare motif on the word "Erschallet"?