用所给动词的适当形式填空。

1. When someone ______(give) you a present, you must open it at once.

2. Chinese eat lots of ______(dumpling) at Spring Festival.

3. Can you ______(finish) ______(do) the work?

4. It's impossible ______(understand) what you are trying ______(say).

5. I could see the smoke ______(rise) from the chimney (烟囱)when I ______(walk) past your

    house at t   his time yesterday.

6. On _____way to school , Jim saw the man fall off his bike .(he)

7. My father likes ______very much .(fish)