instruction:
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.
question:
Passage: In 1990, the Rwandan Patriotic Front (RPF), a rebel group composed of nearly 500,000 Tutsi refugees, invaded northern Rwanda from their base in Uganda, initiating the Rwandan Civil War. The group condemned the Hutu-dominated government for failing to democratize and confront the problems facing these refugees. Neither side was able to gain a decisive advantage in the war, but by 1992 it had weakened Habyarimana's authority; mass demonstrations forced him into a coalition with the domestic opposition and eventually to sign the 1993 Arusha Accords with the RPF. The cease-fire ended on 6 April 1994 when Habyarimana's plane was shot down near Kigali Airport, killing him. The shooting down of the plane served as the catalyst for the Rwandan genocide, which began within a few hours. Over the course of approximately 100 days, around 800,000 Tutsi and politically moderate Hutu were killed in well-planned attacks on the orders of the interim government. Many Twa were also killed, despite not being directly targeted.The Tutsi RPF restarted their offensive, and took control of the country methodically, gaining control of the whole country by mid-July. The international response to the genocide was limited, with major powers reluctant to strengthen the already overstretched UN peacekeeping force. When the RPF took over, approximately two million Hutu fled to neighbouring countries, in particular Zaïre, fearing reprisals; additionally, the RPF-led army was a key belligerent in the First and Second Congo Wars. Within Rwanda, a period of reconciliation and justice began, with the establishment of the International Criminal Tribunal for Rwanda (ICTR) and the reintroduction of Gacaca, a traditional village court system. Since 2000 Rwanda's economy, tourist numbers, and Human Development Index have grown rapidly; between 2006 and 2011 the poverty rate reduced from 57% to 45%, while life expectancy rose from 46.6 years in 2000 to 59.7 years in 2015.
answer:
What is the name of the country that the Tutsi RPF gained control of by mid-July?


question:
Passage: The chain of craters has been the subject of several writers and naturalists. Mark Twain visited Mono Basin in the 1860s and wrote about Mono Lake, but did not mention any of the Mono–Inyo Craters except for the lake's two volcanic islands. He wrote in Roughing It (1872) that the lake was in a "lifeless, hideous desert ..." that was the "loneliest spot on earth ... little graced with the picturesque."
Naturalist John Muir explored the area in 1869. He described the "Mono Desert" as a "... country of wonderful contrasts. Hot deserts bounded by snow-laden mountains,—cinders and ashes scattered on glacier-polished pavements,—frost and fire working together in the making of beauty. In the lake are several volcanic islands, which show that the waters were once mingled with fire."  Muir described the Mono Craters as "... heaps of loose ashes that have never been blest by either rain or snow ..."In the spring of 1881 and the fall of 1882, geologist Israel Russell studied the area as a side-trip during his field research of Lake Lahontan, a now dry lake that covered much of nearby Nevada during the last glacial period. His Quaternary History of the Mono Valley (1889), which included a topographic survey by Willard D. Johnson, was the first thorough scientific description of Mono Lake and its volcanic features.
Russell named the Mono Craters and wrote: "The attention of every one who enters Mono Valley is at once attracted by the soft, pleasing colors of these craters as well as by the symmetry and beauty of their forms. They are exceptional features in the scenery of the region, and are rendered all the more striking by their proximity to the angular peaks and rugged outlines of the High Sierra.".
answer:
What is the name of the place that has two volcanic islands?


question:
Passage: Descriptions of Imogen as a small child indicate that she had blue eyes, fair hair, an oval face reminiscent of her father's, and a rather prominent nose inherited from her mother.  In 1912, at the age of five, she joined the kindergarten class at the Froebel Institute, and remained at the school for five years. Summers were often spent at the Holsts' rented country cottage at Thaxted in Essex, where Gustav Holst began an annual Whitsun Festival in 1916.In 1917 Imogen began boarding at Eothen, a small, private school for girls in Caterham, where Jane Joseph, Gustav's star pupil from SPGS, taught music.  A letter home, dated 17 July 1917, tells of "compertishions [sic], and ripping prizes, and strawberries and cream for tea".  At the school, Imogen studied piano with Eleanor Shuttleworth, violin with André Mangeot (described as "topping") and theory with Jane Joseph ("ripping"). Under Joseph's tuition Imogen produced her first compositions—two instrumental pieces and four Christmas carol tunes—which she numbered as Ops. 1, 2, and 3. In the summer term of 1920, she composed and choreographed a "Dance of the Nymphs and Shepherds", which was performed at the school under her direction on 9 July.Imogen left Eothen in December 1920 hoping to study under Ruby Ginner at the Ginner-Mawer School of Dance and Drama, but was rejected on health grounds, although there appeared to be no significant medical issue. She then studied at home under a governess, while waiting to start at St Paul's Girls School in the autumn. At Whitsun 1921 she took part as a dancer in her father's production of Purcell's semi-opera from 1690, Masque of Dioclesian, held in the St Paul's School grounds and repeated a week later in Hyde Park.In September 1921 Imogen began at St Paul's Girls School, and became a boarder from Spring 1922. In July 1922 she performed a Bach Prelude and Fugue on the piano, for which Joseph praised her warmly, writing: "I think everyone enjoyed the Bach from beginning to end, they all made nice contented noises at the end of it".  Imogen's SPGS years were generally happy and successful. In July 1923 she won the junior Alice Lupton piano prize, but her chances of distinction as a pianist were marred when she began to develop phlebitis in her left arm. Among other activities she became interested in folk music and dance, and in 1923 became a member of the English Folk Dance Society (EFDS).  In 1924–25, her final year at SPGS, Imogen founded a folk dance society in the school. At an end-of-term school concert late in July 1925, she played Chopin's étude in E major and gave the first performance of Gustav Holst's Toccata.
answer:

What is the name o the person who composed and choreographed "Dance of the Nymphs and Shepherds"?