用括号内所给单词的适当形式填空

1. The children have a great time_______(play)  in the Yu Garden.

2. In the past, it was hard for Chinese farmers to make a______(life).

3. My brother has been_______(collect)  stamps since he was five years old.

4. All of us are very_______(interest) in the report about aliens.

5. When did you start_______(practice) playing the piano.