Some people fear that ________ air pollution may bring about changes in _______ weather around the world.

A. /; the       B. the; /       C. an; the        D. the; a

Mary and I see each other ________, but not as often as we used to. 

A. sooner or later    B. once in a while        C. in the end        D. more or less

Many children，______ parents are away working in big cities，are taken good care of in the village.

A. their                   B. whose

    C. of them                 D. with whom

________ many times, he finally understood it.

A. Told     B. Telling    C. Having told    D. Having been told

A person ______ e-mail account is full won’t be able to send or receive any e-mails.

A. who     B. whom    C. whose   D. whoever

I have two bicycles, ____ is made in Guangzhou;____ is made in Shanghai.

        A.One…another     B.The other…one    C.One…the other   D.One..the others

 The truth, Sir, is that the old man____ across the street when my car hit him.

A. was to walk B. had been walkingC. walked D. was walking

_____ in thought completely, he didn’t even know what was going on.

      A. Losing            B. Lost           C. Having lost        D. Having been lost

— I'd rather have some wine， if you don't mind.

    — ____.

A. No， you'd better not                  B. Not at all， anything you want

C. Thank you all the same            D. Yes， but not good

---Is it Pro. King that will give the lecture on radiation?

--- I can't __ I know it for sure.

A. say    B. tell   C. speak     D. talk