用所给词的适当形式填空。

1. Kate ________ (be) ill yesterday.

2.The students had a ________ (terribly)  school trip.

3. It rained all day. And I ________ (stay) at home.

4. Did you go ________ (boat) on the lake yesterday?

5. —What are you doing?

    —I ________ (look) for my pen.

6. Jenny _______ (read) a lot of books last year.

7. He _______ (watch) a video about sharks yesterday.

8. Joe ________ (put) on his coat and went out.

气相色谱法分离原理是什麽？