用所给词的适当形式填空

1. He fell____     (sleep) before he took off his clothes.

2. A bad accident   ____ (happen) to the family last night.

3. He____     (may) be running to catch an early bus.

4. They see a man _       _ (run).

5. We can’t finish    ____ (read) the book in an hour.

蔬菜中也含有一定量的铁，且利用率也高。( )