用所给单词的适当形式填空。

1. He was a natural leader, and when he ____ (command), everyone obeyed.

2. Theory ____ (base) on practice and in turn serves practice.

3. I am just ____ (request) that you keep him safe.

4. The girl ____ (recognize) her father and cried at once.

5. The meeting ____ (expect) to end in the morning.