二．单项选择：（15）
21. Every day we students are expected to _________ at least an hour _______ English.
A.spend…to learn B. cost…on
C. devote…to learning D. take…on learning
22. Stephen Hawking believes that the earth is unlikely to be the only planet ______ life has developed gradually. A. that B. where C. which D. whose
23. --–It’s useless crying over spoiled milk , ?
--–It’s better late than never. Actually, no one has expected it, ___________?
A. isn’t it; have they B. isn’t it; hasn’t he C. is it; have they D. is it; hasn’t he
24. His health required that he_________ as early as possible.
A. go to bed B. would go to bed C. was going to bed D. went to bed
25. The reason ______ he missed school this morning was _______ he had to look after his sick mother A. why; because B. why; that C. which ; because D. which; that
26. China has hundreds of islands, _____ is Taiwan.
A. the largest of them B. and the largest of which
C. and the largest of them D. the largest of those
27. _______ his coming back, don’t forget to tell him about it.
A. As soon as B. The moment C. For the moment D. Upon
28. Water _______ electricity widely all over the world.
