写出单词的适当形式，使句子正确、完整。
1. The boy ________ (help) his sister _______ (make) the snowman now.
2. I _______ (have) a cold last week.
3. You must drive __________ (slow).
4. __________ (one), take a deep breath.
5. Listen! She _______ (sing) in the room.
6. They_______ (visit) their grandparents tomorrow.
7. She likes _______ (dance).