21. — I am really sorry about your MP4 player，you must let me pay for it.
. — -----------------
A．Don’t worry，It’s all right. B．No，you can’t pay for it.
C．Don’t mention it. D．That’s terrible.
22．Which do you enjoy ________ your holiday, going abroad or staying at home?
A. spend B. being spent C. to spend D. spending
23．They want to know ________ do to help us.
A. what can they B. what they can C. how they can D. how can they
24．Is itthey didn’t know the way well ________they finished their work later.
A. for, that B. why, which C. because, which D. because, that