飞行员前4分钟用半速飞行，后4分钟用全速飞行，在8分钟内一共飞行了72千米，则飞机全速飞行的时速是( )。

A．360千米

B．540千米

C．720千米

D．840千米

根据句意及首字母提示补全单词。

1. I'm afraid I can't p_____ get away tonight.

2. Lao She was a famous Chinese a_____ .

3. I hope to pass the f_____ exam at the end of the year.

4. He made an a_____ to see his doctor that morning.

5. I was a_____ to finish my work.