31.Generally speaking,________according to the directions,the drug has no side effect.

A.when taking　　　　　　　　　　 B.when taken

C.when,to take　　　　　　　　　　 D.when to be taken

30.You must keep on working in the evening________you are sure you can finish the task in time.

A.as　　　　　 B.if　　　　　　　 C.when　　　　　 D.unless

29.________,I have to put it away and focus my attention on study this week.

A.However the story is amusing

B.No matter amusing the story is

C.However amusing the story is

D.No matter how the story is amusing

28.His plan was such a good one________we all agreed to accept it.

A.so　　　　　 B.and　　　　　　 C.that　　　　　 D.as

27.I had just stepped out of the bathroom and was busily drying myself with a towel________I heard the steps.

A.while　　　 B.when　　　　　　 C.since　　　　 D.after

26.Jenny was very sad over the loss of the photos she had shot at Canada,________this was a memory she especially treasured.

A.as　　　　　 B.if　　　　　　　 C.when　　　　　 D.where

25.-Did Jack come back early last night?

-Yes.It was not yet eight o’clock________he arrived home.

A.before　　　 B.when　　　　　　 C.that　　　　　 D.until

24.If you are traveling________the customs are really foreign to your own,please do as the Romans do.

A.in which　　 B.what　　　　　　 C.when　　　　　 D.where

23.-Why didn’t you tell him about the meeting?

-He rushed out of the room________I could say a word.

A.before　　　 B.until　　　　　 C.when　　　　　 D.after

22.Mother was worried because little Alice was ill,especially________Father was away in France.

A.as　　　　　 B.that　　　　　 C.during　　　　 D.if