24. ---I’m thinking of the test tomorrow, I’m afraid I can’t pass this time.

　 ---________!

A. Go ahead　 B. No problem 　C. Good luck　 D. Cheer up

23. ---Tom is never late for work. Why is he absent today?

　 --- Something______ to him.

A. must happen　 　　　　B. could have happened

　C. should have happened　 D.must have happened

22. The reader who has spent serious effort on a problem may ___ from the effort even if he doesn’t succeed in solving the problem.

A. come　　 　　　 B. conclude 　C. benefit　 D. judge

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

21. The president has ____ eight-year-old daughter, who has ____ gift for painting.

A. a, the 　　B. an , a 　C. an, the 　D. a, a