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2. The lake is dirty. It used (be) very clean.

  2. to be

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3. 这种方法在学习中起到了重要的作用。(play an important part in)

       

() 5. The box is . There is nothing in it.

   A. tired   B. embarrassed

   C. empty   D. full

10. I felt  (luck) to be alive after the traf fic accident.

() 4. Catherine got married a police man twenty years ago.

   A. with   B. for   C. to   D. from

3. The new bike c her 100 dollars.

2. 我们可以利用网络学习。

We can the Internet to learn.

2. We (learn) more than 1 ,000 words so far.

7. Have you ever heard Guo Jingming?

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