Hurry up, Mike. You must get to the airport an hour before the plane _______.

A．gets off

B．turns off

C．takes off

D．puts off

根据汉语完成下列各句。

1.平衡饮食很重要。

    It's important _____.

2.我胃疼，不想吃东西。

     I _____ and I don't want to eat anything.

3. 多吃蔬菜可以帮助你保持健康。

    Eating          vegetables          you to           in good health.

4. 每个人都有累的时候。

              tired sometimes.

5. 我相信学好英语是有用的。

    I believe             learn English well.