题目内容：

完成句子。根据中文意思完成句子。

1.毫无疑问乘飞机去花钱最多。

Their is              that it is the most expensive to go by air.

2.众所周知，雾霾对我们的健康很有害。

As we know , haze is quite              our health.

3.只要你用心学习，你就会取得进步。

__________________ you put your heart into the study, you may make progress

4.如果有必要，你可以打电话向我求助。

_______，you can call me for help．

5.地球是颗行星，它绕着太阳转。

The earth is a planet and it _________ _________ the sun.