用所给词的适当形式填空。
1. It's senen o'colock, let's _____(have) supper.
2. We should _____(exercise) all the time.
3. When the teacher came in, We all stopped _____(talk).
4. Li Mei is the _____(good) student in our class.
5. She has _____(work) here for ten years.
6. Chinese teacher is coming! Let's stop_____(have) lessons .