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4. The math problem is very easy. It        (simple) took me one or

two minutes to work it out.

4. simply  

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(   ) 3. 一Where are you going for your holiday? 

     -—Well,we       yet.

   A. haven't decided   B. hadn't decided

   C. don't decide   D. didn't decide

3. I have t       different kinds of food around the world,but I like Chinese food best.

9. choose to do sth.        

4. My favorite season is        (春天) .

3. 朝鲜离中国不远。

North Korea is not        China.

5. a couple of months        

(   ) 4. The Changchun-Hainan airline      for many years. And I have taken the flight three times.

   A. is open   B. has opened

   C. has been open   D. has been opened

(   ) 1. Do you know that the earth is home to      animals?

   A. million   B. millions

   C. million of   D. millions of

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