听一段材料，回答下面几个小题。
Why did Mark Twain’s friend ask him to buy a ticket for him?
A.He was a poor man.
B.He had lost his money.
C.Mark Twain was kind.
What was the friend doing when the conductor came to check the tickets?
A.He was lying on the seat.
B.He was sitting on the seat.
C.He was lying under the seat.
Why did Mark Twain talk in a loud voice?
A.To make his friend hear.
B.To make the conductor hear.
C.To make the passengers hear.