18. If the doctor had been available, the child ___.

A. would not die　 B. would not have died　 C. could not die　 D. could not have died

17. It is high time we ___ up our results.

A. sum B. summed C. will sum D. would sum

16. It is important that you ___ a communication with Mr. Willians immediately.

A. have B. had C. will have D. would have

15. The two strangers talked as if they ___ friends for years.

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

14. I was busy yesterday, otherwise I ___ your birthday party.

A. attended B. had attended C. would attend　 D. would have attended

13. The teacher agreed to the suggestion that the students ___ two weeks to prepare for the exam.

A. give B. should give　 C. be given D. would be given

12. It is really strange that Marry, who is still a college studnet ,　 ___ so early.

A. has been married　 B. has married　 C. be married　 D. would marry

11. I would have come earlier, but I ___ that you were waiting for me.

A. didn’t know B. hadn’t know C. would have known D. haven’t known

10. If he ___ to the teacher attentively, he ___ the answer to the problem now.

A.had listened, would have known　 B. listened, would know

C. listened, would have known　　 D. had listened, would know

9. If only I _____ how to operate an electronic computer as you do.

A. had known B. would know C. should know D. knew