20．Around the shopping center　　　　 a lot of buildings,　　　　 many residents live.

　　　 A．are; in which　　　　　　　　　　　　　　　　　　　 B．has; next to which　　

　　　 C．is; where　　　　　　　　　　　　　　　　　　　　　　 D．have; that

19．In the dark street, there wasn’t a single person　　　　 she could turn to for help,　　 made her frightened.

　　　 A．that; that　　　　　　 B．x; which　　　　　　　 C．whom; who　　　　 D．which; which

18．I don’t doubt　　　　 they can finish the task ahead of time.

　　　 A．whether　　　　　　　 B．if　　　　　　　　　　　　 C．that　　　　　　　　　　 D．why

17．-Could you tell me why he was arrested?

-He happened to　　　　 on the train for Shanghai.

　　　 A．be stepping　　　　　 B．be seen picking　　 C．be caught to pull　 D．catch damaging

16．It was　　　　 　we were having dinner at the table　　　　 there was a knock at the door.

　　　 A．where; while　　　 B．which; as　　　　　　 C．when; after　　　　　 D．when; that

15．It is　　　　 that his drawing is　　　　 perfect.

　　　 A．sure; very　　　　　　 B．certain; quite　　　 C．exact; fairly　　　　 D．right; rather

14．Lily was so badly ill, as was known to us all, that she couldn’t help　　　　 the meeting room.

　　　 A．clean　　　　　　　　　 B．cleaning　　　　　　　 C．being cleaning　　 D．to be cleaned