用所给动词的适当形式填空，必要时可加助动词。

1. If you want to cross a street, you ______ （wait） for the green light.

2. American fast food seems ______ （be） the most popular in the world.

3. They______ （eat） a lot of potatoes yesterday, so _____ I.

4. My mother made me_______ （clean） my room all by myself yesterday.

5. Please look carefully before you _______ （cross） the street.

6. There ______（not, be ） enough people to pick apples last September.

7._______ Mary ______ （move） to Japan a few weeks ago?

8. There ______ （be） no schools here in the past.

9. They ______ （plan） to go to Kunming for a holiday now.

10. Please don't forget______ （turn） off the lights before you leave.