1 . They find it important ________ (protect) the environment.

2 . 工人们将用两年的时间来建造这座大桥。
The workers will ________ two years ________ this long bridge.

3 . 太阳、月亮和地球，哪一个最大？
__________, the sun, the moon or the earth?

4 . One of my __________ (classmate) comes from Africa.

5 . He ________ ________ (更愿意) drink tea to coffee in the past.

6 . We saw the sun ________ behind clouds and then it began to rain heavily. (appear)

7 . You can climb the beautiful mountain in any season __________(除了) winter.

8 . ________ (几个) of the bikes here are broken.

9 . They will go to Beijing on vacation next week. They will have enough time.（合并为含if的复合句）
They will go to Beijing on vacation next week ________ they ________ enough time.

10 . — If it ________ this Sunday, let’s go to the countryside.
— OK! But nobody knows if it will rain in three days.

A．won’t rain

B．rains

C．doesn’t rain