26.Don't all speak at once! 　　　, please.

A.Each at one time　　 B.One by one time

C.One for each time　 D.One at a time

25.The missing boys were last seen　　　 　near the river.

A.playing　　　　　 B.to be playing

C.play　　　　 D.to play

24.-How long has this bookshop been in business?

-　　　 1982.

A.After　　　 B.In C.From　 D.Since

23.-Shall I tell John about it?

-No, you　　　 . I've told him already.

A.needn't　　 B.wouldn't　　　 C.mustn't D.shouldn't

22.Rather than　　　 on a crowded bus, he always prefers

a bicycle.

A.ride; ride　　　　 B.riding; ride

C.ride; to ride　　 D.to ride; riding

21.-I must apologize for 　　　　ahead of time.

-That's all right.

A.letting you not know　　 B.not letting you know

C.letting you know not　　 D.letting not you know

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