20.She is　　　 　newcomer to 　　　　chemistry but she has alre

ady made some important discoveries.

A.the; the　　 B.the ; 不填　 C.a; 不填　　 D.a; the

19.-I'm sorry to keep you waiting.

-Oh, not at all. I 　　　　here only a few minutes.

A.have been　 B.had been　　 C.was　　　　 D.will be

18.She set out soon after dark　　　 　home an hour later.

A.arriving　　　　　　　　 B.to arrive

C.having arrived　　　　　 D.and arrived

17.-Hi, haven't seen you for ages! You look fine!

-　　　 . You look well, too.

A.Great　　　 B.Thanks　　　 C.Oh, no　　　 D.Not at all

16.I told Sally how to get here, but perhaps I　　　 　for her.

A.had to write it out

B.must have written it out

C.should have written it out

D.ought to write it out

15.-Can I join your club, Dad?

-You can when you　　　　　　 　a bit older.

A.get　　　　　　　　　　　 B.will get　　

C.are getting　　　　　　　 D.will have got

14.-Would you like to come to dinner tonight?

-I'd like to, 　　　I'm too busy.

A.and　　　　 B.so　　　　　 C.as　　　　　 D.but

13.-Do you think it's going to rain over the weekend?

- 　　　.

A.I don't believe　　　　　 B.I don't believe　 it

C.I believe not so　　　　 D.I believe not

12.-Do you remember 　　　he came?

-Yes, I do, he came by car.

A.how　　　　 B.when　　　　 C.that　　　　 D.if

11.-Is your camera like Bill's and Ann's?

-No, but it's almost the same as 　　　.

A.her　　　　 B.yours　　　 C.them　　　　 D.their