4. It's n       Let's have lunch.

3. Bob is very clever and hard-working,so Miss Green       (重视)him very much.

2. I am going to d      in on you if I have time.

1. It is well known that Switzerland is the c       of clocks and watches.

20. 人们不f以在这儿抽烟。

People__________ _________ __________ _________ smoke here.

19. 他应该一个小时前就到那了。

He_______ __________  ____________ ____________       there an hour ago.

18. 一天将下雨了。一我看不见得。

-一It will be rainy.
I__________  _______ .

17. 在中国，人们第一次见面时应该握手。

In China,people are supposed to___________       when they meet for the first time.

16. 你不应该在这里打电话。

You are_________  _________  ________ make a call here.

15. They are supposed to invite Mike to the birthday party next Sunday,(对画线部分提问）