Our teacher often encourages us ______ hard.

A.work B.to work C.working D.to working

The exciting thing has ______ these boys' attention.

A.left B.drew C.given D.drawn

All the butterflies have left ______ the north in spring.

A.to B.for C.at D.from

There are many mysteries to ______ by scientists.

A.discover B.discovering C.be discovered D.be discovering

Don't cut down the trees ______ the butterflies need to rest on.

A.that B.what C.who D.where

根据汉语提示完成句子

1.去年，多达300名学生参加了校运动会。

______ ______ ______ 300 students took part in the school sports meeting last year.

2.越来越多的人对科学感兴趣了。

More and more people ______ ______ ______ science.

3.大自然的秘密是很有趣的。

The ______of ______ are very interesting.

4.人们把这些树全部砍倒了。

People have ______ ______ all the trees.

5.这些树几乎完全被覆盖了。

These trees ______ ______ almost completely.

连词成句

1.kilometres，this，is，wide，only，20，forest

_____________________________________________________.

2.him，this，does，a，lot，worry

_____________________________________________________?

3.south，they，fly，when know，to

_____________________________________________________.

4.snow，completely，the，the，covered，ground

_____________________________________________________.

5.created，there，be，things，are，new，to，many

_____________________________________________________.

I'm waiting for my friend.______，I'll go shopping alone.

A.If she comes

B.If she will come

C.If she doesn't come

D.If she didn't come

She looks beautiful ______ she is not young.

A.so that B.even if C.as if D.ever since

The rain stopped and the sun ______.

A.come out B.came out C.come on D.came in