3. One of the boys in the class had a fever and he soon i　　　　　　 　(感染) other children.

2. After a year, she was c　　　　　　　 　(治愈)of cancer, and she still works happily now.

1. V　　　　　 　(病毒)cause illnesses such as the common cold, flu and measles.

35.With your ability, you 　　　　out the puzzle within a few minutes.

A. could have worked　　　　　　　　　　　　　 B. need have worked

C. ought have worked　　　　　　　　　　　　　 D. must have worked

34.Without electricity, what 　　　　　?

A. will the world be like　　　　　　　　　　　 B. would the world be like

C. the world will be like　　　　　　　　　　　 D. the world would be like

33.Look. What you’ve done! You 　　　　have been more careful.

A. should　　　　　　　　 B. may　　　　　　　　 C. ought　　　　　　　 D. would

32.The two strangers talked as if they 　　　　friends for years.

A. should be　　　　　　 B. had been　　　　　 C. have been　　　　 D. were

31. -What will you do during winter vacation?

-I don’t know, but it’s about time 　　　　something.

A.I decided　　　　　　　 B. I’ll decide　　　　 C. I’d decided　　　　　　　　　　 D. I’m deciding

30.　　　 the fog, we should have reached our school.

A. Because of　　　　　 B. In spite of　　　　 　 C. In case of　　　 　　　　　　 D. But for

29.I can’t stand him. He always talks as though he 　　　　everything.

A. knew　　　　　　 B. knows　　　　　　　　　　 C. has known　　　　　　　　　　 D. had known