24. Five minutes earlier, ______ we could have caught the last train.

　 A. or　　　　　　 B. but　　　　　 C. and　　　　　 D. so

23. What______ to do if he needs the book?

　 A. has he 　　　　B. he has　　　　 C. will he have　 D. he will have

22. We’re not going to operate on him________ it is absolutely necessary.

　 A. if　　　　　　 B. unless　　　　 C. as long as　　 D. so far as

21. Let her do that, if she________.

　 A. does　　　　　 B. is　　　　　　 C. will　　　　 D. will do

20. If you _______ it, I will lend the novel to you.

　 A. read　　　　　 B. will read　　　 C. have read　　 D. want read

19. You’ll fail in the driving test______ you have more practice.

　 A. if　　　　　　 B. unless　　　　 C. when　　　　 D. after

18. Do you mind_______?

　 A. if I sit here for a moment　　　　 B. if my sitting here for a moment

　 C. if I will sit here for a moment　　 D. I sitting for a moment

17. -Did you catch the first bus this morning?

　 -No. It had left the stop______ I got there.

　 A. as soon as　　　 B. at the time　　 C. by the time　　 D. during the time

16. It seemed only seconds______ the boy finished washing his face.

　 A. when　　　　　 B. till　　　　 C. after　　　　 D. before

15. It’s a long time since I enjoyed myself. This sentence means______.

　 A. I enjoyed myself for a long time

　 B. I haven’t enjoyed myself for a long time

　 C. I want to enjoyed myself

　 D. what a long time after I enjoyed myself