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.

Passage: In 1916, childhood best friends, Bob Wilson and Fred von Bergen, are test pilots working for an American company that builds bombers for the European allies. Since he is German-born and faces prejudice against his heritage, Fred loses his job and, unable to find other employment, decides to return to Germany to fight for his homeland. Although he has no special attachment to the German cause, Bob quits the aviation company and joins his friend in Germany.
On their way to a German airfield, Red Cross nurse Alida Hoffman accidentally runs Bob and Fred off the road, Both men are immediately drawn to Alida, especially Bob although Fred is more shy. After Bob's first unsuccessful mission, Captain Wolters, the squadron's tyrannical leader, expresses his doubt about his loyalty but, desperate for pilots, gives him another chance.
As the United States is drawn into the war, instead of sending him into a crucial air battle, Wolters arrests Bob. Fred, heartbroken that Alida has chosen Bob, quarrels with his friend, calling him a coward. Later, however, Fred allows his friend to escape from a firing squad and flee to the Allied lines.
To prove his allegiance, Bob leads British bombers to the German base, while Fred is told by Wolters that he must shoot down Bob to prove his loyalty. Neither man is capable of killing the other, and, in the end, Fred sacrifices his life for Bob. After the war, Bob returns to Germany to marry Alida. The newly married couple then returns to the United States, and pay their respects to Fred's mother.
What is the first name of the man that is fired for being German-born?

Passage: The SSSI is designated as a Special Protection Area for birds for its variety of coastal habitats. The large breeding colonies of Sandwich terns and little terns, especially those at Blakeney Point and Scolt Head Island, are of "European importance" as defined in the Birds Directive, and the coast as a whole meets Natural England's criteria for nationally important populations of common terns, pied avocets and reedbed specialists like western marsh harriers, Eurasian bitterns and bearded reedlings. Other birds nesting in the wetlands include the northern lapwing, common redshank, and sedge, reed and Cetti's warblers. Ringed plovers and Eurasian oystercatchers lay their eggs on bare sand in the dunes. Little egrets, Eurasian spoonbills, ruffs and black-tailed godwits are present for much of the year, and the egret and spoonbill have both started nesting within the SSSI.In spring and early summer, migrant birds including the little gull, black tern, Temminck's stint and garganey may pass through on their way to breed elsewhere. In the autumn, birds arrive from the north; some, such as whimbrels, curlew sandpipers and little stints, just pausing for a few days to refuel before continuing south, others staying for the winter. Offshore, great and Arctic skuas, northern gannets and black-legged kittiwakes may pass close by in favourable winds. Large numbers of ducks winter along the coast, including many Eurasian wigeons, Eurasian teals, mallards and gadwalls, goldeneyes and northern pintails. Red-throated divers are usually on the sea, and brent geese feed on sea lettuce and other green algae. Barn owls and sometimes hen harriers quarter the marshes in winter, and snow bunting flocks can be found on the beaches. Thousands of geese, mainly pink-footed, roost at Holkham.The SSSI's north-facing east coast location can be favourable for huge numbers of migrating birds when the weather conditions are right. These may include vagrant rarities. A black-winged stilt, which acquired the nickname "Sammy", arrived at Titchwell in 1993 and became a permanent resident up to its disappearance in 2005. Other major rarities included a western sandpiper at Cley in 2012, a rufous-tailed robin at Warham Greens in 2011, and a black-winged pratincole at Titchwell in 2009.
What is the nickname of the black-winged stilt that appeared in 1993?

Passage: Audioslave's musical style has generally been regarded as hard rock, alternative metal, post-grunge, and alternative rock. By combining '70s style hard rock riffing with alternative rock, Audioslave created a distinctive sound. This mix was driven by Cornell's wide vocal range, Morello's innovative guitar solos and the robust rhythm section of Wilk and Commerford. Morello, although stating he "never felt musically limited" in Rage Against the Machine, did say that he had "a lot more scope to explore with Audioslave" and a "wider musical territory." This meant that the instrumentalists had the opportunity to write slow and melodic songs, something they had not done before.
As opposed to de la Rocha's lyrics, Cornell's were mostly apolitical; Morello referred to them as "haunted, existential poetry." They were characterised by his cryptic approach, often dealing with themes of existentialism, love, hedonism, spirituality and Christianity. Audioslave's first two albums drew influences from 1970s hard rock and heavy metal such as Led Zeppelin and Black Sabbath and from the members' previous bands (the grunge sound of Soundgarden and the funk metal sound of Rage Against the Machine). For Revelations, which was influenced by 1960s and '70s funk, soul and R&B music, Morello used vintage guitars and amplifiers and Cornell adopted his "seventies funk and R&B-flavor vocals." The guitarist also cited Sly & the Family Stone, James Brown and Funkadelic as a reason for the funk overtones on the album.Just as Rage Against the Machine did, Audioslave also included the statement "All sounds made by guitar, bass, drums and vocals" in their albums' booklets as Morello's guitar work often caused listeners to believe that the band used samples, synthesiser effects or different turntable techniques to produce certain sounds.
Whose cryptic approach characterized the lyrics that often dealt with themes of existentialism, love, hedonism, spirituality and Christianity?