用单词的适当形式填空。

1. He is 10      ___  (year) old.

2. His father often ______ (relax) for half an hour after lunch.

3.There are many green ______ (leaf) on the tree in summer.

4. Molly likes      ___   (play) with her friends and eats    ____  (grass).

5. Bill usually ______ (sleep) during the day.