1. B. difficult
Explanation: "Challenging" or "difficult" both make sense in the context, but "difficult" fits better with the idea of a challenging situation involving a difficult task.
2. C. career
Explanation: The phrase "career spot" is correct, as it refers to a position in someone's long-term professional path.
3. B. share
Explanation: In this context, "share" makes sense, as the musician is talking about giving someone a part in a performance, suggesting collaboration or sharing.
4. C. was called
Explanation: The past tense "was called" works here as it is a recount of a past event.
5. A. among
Explanation: "Among" is used when referring to more than two items or people. "Among" fits here because the context suggests a group.
6. A. instruments
Explanation: "Instruments" is the correct word since the passage talks about a band playing musical instruments.
7. C. to
Explanation: The correct preposition is "to," as the bass player is introducing Lennon to McCartney.
8. C. regular
Explanation: "Regular" is the correct word, meaning a consistent or permanent role in the band.