21.  The shop _________ until 7 o’clock.

A.stays opened　　　　　　　　　 C. continues open

B.stays open　　　　　　　　　　 D. continues opened

--May I have a talk with one of your sports reporters?　--Sorry, but all of them are out to_______the main events of the day.

　 A. get 　 B. find

　 C. cover 　 D. search

.It isn’t yet known how these huge stones were conveyed_____a distance of 3800 kilometres 30000 years ago.

A.at 　　　 B.for 　　　　　 C.over 　　　　　　 D.in

我们受到忠告，在这种条件下不要冒险旅行。（risk doing）

I’m considering 　　　 a new car.?

A.buying　　 B.buy　　 C.to buy　　 D.of buying

—You can have a pet dog, but suppose you get bored with it in a few days? _____？

—We won’t, we promise!

A. Then what　 B. All right C. How come 　　 D. So what

— These boxes are too heavy for me to move.

　 — Here, I’ll give you a hand ____ them.

　 A. for　 　　 B. to　　　　 　 C. with　　　 D. by

Madane curie’s _____ encouraged many women to study science and many of them _____.

A. succeeded; succeeded 　 B. success; success

C. succeeded; success 　 D. success; succeeded

He studied hard and later became a well-known writer, ____ his father expected.

A. that was what 　B. what was that 　C. and which was 　D. which was what