5. cycles→has been cycling

6. didn't receive→haven't received

7. have had→were having

8. have written→was writing

9. troubles→was troubling

10. waited→have been waiting

Ⅲ. 完成句子

1. Since the time humankind started gardening, we_____ ____ _____ to make our environment more beautiful.

自从人类开始搞园艺活动以来, 我们一直都在努力让我们的环境更美丽。

2. She____ _____ _____ for 6 hours and still cannot wake up.

她已经睡了六个小时了, 到现在还叫不醒。

3. The tobacco industry____ _____ _____ to improve its image.

烟草行业一直在试图改善其形象。

4. Jim____ _____ _____ Jenny every night for the past week.

一星期以来吉姆每天晚上给詹妮打电话。

5. The two parties_____ ____ _____ _____ _____ since the New Year.

自从新年以来, 双方就一直在试图联手。

6. I____ _____ _____ the book for almost 4 hours, but I haven't finished it.

这本书我读了接近四个小时了, 但我还没读完。

7. Where_____ ____ _____? We____ _____ _____ _____ _____ everywhere.

你到哪里去了? 我们在到处找你。

8. Kate_____ ____ _____ _____ her new novel, which is supposed to come out next month.

凯特一直在致力于她的新小说, 这部小说下个月将出版。

9. He_____ ____ _____ articles to this magazine all these years.

这些年他一直为这家杂志写稿。

10. I_____ ____ _____ forward to seeing you for a long time.

好长时间以来我一直渴望见到你。

答案: 1. have been trying

2. has been sleeping

3. has been trying

4. has been phoning

5. have been trying to unite

6. have been reading

7. have you been; have been looking for you

8. has been working on

9. has been contributing

10. have been looking

Ⅳ. 语法填空

阅读下面短文, 在空白处填入1个适当的单词或括号内单词的正确形式。

　　Earlier this week, Paula Grzelak-Schultz left her car parked outside Original Joe's pub overnight. When she returned to get it the next morning, she found a piece of paper stuck 1. ___________her windscreen. She sighed, 2. ___________