根据句意，用所给词的适当形式填空。

1. We'd like to come. We look forward to ______ (see) you at the party.

2. Amy invites us ______ (visit) the Palace Museum tomorrow.

3. I often exercise ______ (little) than three times a week.

4. — Oh, look at the sun! 

    — Yes. It's a ______ (sun) day today.

5. Mum often makes Kitty ______ (do) her homework before dinner.

6. A policeman ______ (come) and caught the robbers.

7. There are a lot of ______ (shelf) in our school library.

8. My parents left for Beijing on the ______ (twenty) of March.

9. Be ______ (careful)! You must cross the road ______ (careful).

10. It is cloudy. The radio says it ______ (rain) tomorrow.