一、用所给词的适当形式填空
1. _________ (not look) outside. Come in and let’s begin our class.
2. It’s raining. We have to _________ (stay) at home.
3. _________ he _________ (have) to arrive there before ten o’clock?
4. _________ (not be) late for the meeting, please.
5. The teacher told us _________ (not fight) with each other.
6. Tom and his father often_________ (swim) together.
