问题补充：
1. Great changes (take) place in our country in the past thirty years.
2. Peter prefers to stay at home watching TV rather than (go) there alone.
3. Now that the headmaster (approve) the plan, we can carry it out now.
4. In some countries, missing a bus means (wait) for another half an hour.
5. (chat) on line took him a lot of time, which led to his failure in the exam.
6. The law requires that everyone (have) his car checked at least once a year.
7. (achieve) success, you should concentrate on what you are doing.
8. It’s a pity that I missed (see) the film which was on at the cinema last week.
9. When I entered, the teacher, along with her lovely students, (dance) to the music.
10. Susan couldn’t tolerate (work) for twelve hours a day and decided to change her job.have taken
答案：
(答案→)have taken
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