配套同步单元测试题。内容紧扣教材，难度适宜。附有参考答案和听力材料。

二、单项选择（共10小题；每小题1分，满分10分）
(   )1. It’s generous ______ them to donate money to UNICEF. They think it’s important ______them to help poor children go to school.
A. to, for      B. for, of          C. of, to     D. of, for
(   ) 2.Mr. Wu _____ this math problem _____him many times, but he still doesn’t understand it.
A. explains ; to                             B. have explained ; for
C. has explained ; to                         D. explained ; with
(   ) 3. She has spent _____on her study, but the result of her study isn’t______.
A. enough time ; enough good                 B. time enough ; well enough
C. time enough ; enough good                 D. enough time ; good enough
(   ) 4. We must run, _____ we will miss the train.
A. so                B. otherwise          C. though         D. but