用所给单词的正确形式填空。

1. I'm going to              (live) in the United States.

2. He              (buy) a red sports car last year.

3. He wants to              (help) the old people.

4. He is going to               (play) football once a week.

5. They              ( have) a terrible time in London last winter vacation.

6. It's eight o'clock now. The students are              (have) a physics class now.