用所给的单词的适当形式填空。
1. Can you________(help) me with my math?
2. please_________(stay) on the sidewalk.
3. _______ (not cross) the street now.
4. Let’s________ (sing) this song together.
5. Be careful! A car______ (come).
6. I like ______(stay) at home on Sundays.
7. You can_______(go) along this road until you reach the end.
8. Let the old_________(sit) down first.