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21、This kind of test is more____ . I’m afraid that many of you will not be able to pass it.

A. important    B. challenging    C. interesting    D. enjoyable

20、I____ much weight in the past two months, so I think the weight-loss pills____ very well.

A. have lost; do   B. lost; work    C. have lost; work   D. lost; do

19、I don’t think the necklace is made of diamond,____?

A. do I      B. do you      C. isn’t it      D. is it

18、-----We were not sure which way to go. In the end we turned right.

-----You went the wrong way. You____left.

A. must have turned             B. must turn

C. would have turned           D. should have turned

17、It’s not surprising you’re tired. ____. you____up until 12 o’clock last night.

A. At all; worked  B. After all; stayed  C. After all; put   D. First of all; turned

16、We must inform them____ any changes that we make to the plan.

A. of       B. on       C. with      D. in

15、Next winter, ____ you will spend in Harbin,will be another exciting holiday.

A. when    B. which    C. that      D. where

14、Everyone in our class was working hard and doing what we could _______ a good college.
A. enter           B. to enter        C. entering        D. entered

13、I think we should _________ all these old toys to the local children hospital.
   A. give away                       B. give out
   C. give off                          D. give in