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—Do you mind if I smoke?

    —____

    A. Why not?     B. Yes, help yourself    

    C. Go ahead     D. Yes, but you’d better not

Please make my excuse at tomorrow’s meeting--- I’ve got too much work _____.

A. to do to come B. doing coming C. to do coming D. doing to come

—Where do you think _____ he _____ the computer？

 —Sorry，I have no idea.

A. had；bought B. has；bought C. did；buy D.／；bought

The person we talked about ____ our school last week．

A．visiting B．will visit C．visited D．has visited

It is not enough only_______the rules of grammar if you want to learn English well.

A. keeping in the mind       B. to keep in mind

C. to keep in your mind      D. keeping in your mind

— You _____ stop me.

— Even if you _____ it, I won’t allow you to do it.

A. mustn’t…dare not do  B. may…dare not do

C. can…dare to do        D. needn’t…dare do

If we________ , we can realize the progress we have made in space research.

A. turn back         B. look back   C. answer back       D. move back

You have made a few spelling mistakes in your composition, but ____, it is fairly good.

    A. on the whole                     B. generally speaking 

    C. above all                             D. on one hand

If we work with a strong will, we can overcome any difficulty, _____ great it is.  

A. what               B. how                  C. however             D. Whatever

We students got lost in the forest and decided to remain ____we were and waited for the guide

A．where    B．what     C．how  D．who