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______ great achievements China may have in the future, it is likely that many of them will be born in Western China.

A. If　　　　　 B. Whatever　　　 　　　 C. As　　　　　　　 D. However

The plant may grow to a height of several meters d______ on soil conditions.

Look at this! I＿＿some magazines and＿＿this letter.
A. was looking through； found                B. am looking through； find
C. looked through； had found                 D. had looked through； finding

This kind of food product is natural, with no_____flavours added.

A. accurate　　　　　 B. regular　　　　 C. sensitive　　　　 D. artificial

.When I was passing the National Hall, I heard the clock _____________________(敲響).(strike)

 She had just finished her homework ____ her mother asked her to practice playing the piano yesterday.
 A. when        B. while       C. after        D. since

____ of the Russian students, teachers and parents was over 1,000; and ____ of them were killed unfortunately.

A. The number; the number　　　 　　　 B. The number; a number

C. A number; half　　　　　　　 　　　 D. A number; three quarters

We believe that the Chinese astronauts will 　　　　 on the moon sooner or later.

A. turn out　　　　 B. turn up　　　 C. send up　　　 D. carry out

_____ in the fields on a March afternoon, he could feel the warmth of spring. .

　 A. To walk.　　　　　 B. Walking　　　　 C. Walked　　　　　 D. Having walked

At first he hated the new job but decided to give himself a few months to see ______ it got any better.　

A. when　 　　 B. how　 　　　 C. why　 　　D. if