21. I was very busy yesterday, otherwise I 　　　　　to the meeting.　 (come)

20. Galileo insisted that the earth　　　　 　round the sun.　 (move)　

19. I wish I　　　　 　my uncle yesterday.　 (meet)

18. It is strange that he　　　　 　so.　 (think)

17. What would have happened if you　　　　　 her child?　 (not help)

16.Without the Communist Party there ____ New China.

15.If there _____ no electricity in the future, our life _____ a lot.　 (be, change)

14.It is about time you ____ the medicine, sir.　　 (take)

13.I’d rather Tom _____ tomorrow.　　 (come)

12. It was ordered that no smoking _____ in the library, which made the smokers unhappy.　 (allow)