138.While convenient for communication, mobile phones may have a negativeon children.

7. I want to tell you is that I love my parents deeply.

6. may surprise you isI am very nervous and upset when taking an exam.

5.It worries her a lot her son hasn＇ t contacted her for three days.

4.the potato was introduced into Europe is uncertain, but it was probably around 1565.

3.Cindy shut the door heavily and burst into tears. No one in the office knewshe was so irritated.

2.The most pleasant thing of the rainy season iswe can freely enjoy the fresh air after it rains.

1.She asked me I had returned the books to the library, and I told her that I hadn＇t.

65.After you finish reading, be sure to place the bookit used to be.

64.We must improve the farming methodwe may get high yields.

63.he retires, Prof. Baker will have taught in the university for almost forty years.