13.We should try to study best.

12.The teacher asked us, “How do you solve this problem?”

11.She is good at playing tennis.

10.Wang Fang stopped a fire from burning and she saved her neighbor.

9.They are not happy.(否定句)

8.Take a seat, please. (同义句)

7.She found a purse on her way home. (用Tom代替she改写句子)

6.He could not speak Chinese before. (用now代替before改写句子成肯定句)

5.His friend will be away from here for two months.

4.Our teacher is recommending Amy for the Best Sports Player Award.