3. Look! All the runners ____________（breathe）heavily after the race.

are breathing

4. Tell John ____________（not cover）the table with newspapers.

not to cover

5. Are you interested in ____________（learn）about different landforms?

learning

6. My teacher tells me ____________（work）hard.

to work

7. ____________ Miss Li ____________（teach）us Geography next term?

Will, teach

1. 全世界三分之一的淡水来自地下。
____________ ____________ ____________ of the fresh water comes from the underground in the world.

One third of the fresh water

2. 沙漠主要是由沙子组成的。
Deserts ____________ ____________ ____________ ____________ sand.

are mostly made of sand

3. 一些动物能在这么热的地区生活，太神奇了。
It’s amazing that ____________ ____________ ____________ ____________ ____________ live in such hot areas.

a few animals can live in such

4. 陆地覆盖大部分地表吗？
____________ ____________ cover most of the earth’s surface?

Does land cover most of

5. 数十万生物生活在这个星球上。
____________ ____________ ____________ live on this planet.

Hundreds of thousands of living things

Have you ever been to Lake Baikal(贝加尔湖). What do you 1 about Lake Baikal?
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　
Lake Baikal in Russia is one of the world’s 2 lakes. It has a history of 25 - 30 million years. It’s also the world’s deepest（深）freshwater lake. It’s up to about 1 637 metres deep. 3 , it’s not only a lake but also the world’s future fifth ocean with nearly 20％ of the planet’s unfrozen（未结冰的）fresh water. The water is 4 clean that people can drink it directly（直接地）.
Lake Baikal is in the 5 of the banana and people also think it looks like a crescent（月牙形）moon. Lake Baikal is beautiful and a lot of 6 come to visit it every year. They usually come in summer. It is not cold then. They can 7 the blue water and the green mountains. However, some people prefer（更喜欢）to come in winter. It is cold, 8 they can have fun on the ice. The ice can be up to 60 cm thick(厚的). Some people think there is 9 more beautiful than the blue ice. It’s such a wonderful view and they don’t want to 10 it. They feel free to do whatever they like, without worrying about falling into the ice.
（ ）1. A. worry B. dream C. care D. know
（ ）2. A. cleanest B. oldest C. most difficult D. most dangerous
（ ）3. A. At first B. For example C. In fact D. At last
（ ）4. A. and B. such C. like D. so
（ ）5. A. shape B. place C. front D. size
（ ）6. A. visitors B. climbers C. volunteers D. pets
（ ）7. A. share B. drink C. enjoy D. wash
（ ）8. A. because B. but C. or D. till
（ ）9. A. nothing B. something C. anything D. everything
（ ）10. A. deal B. wonder C. check D. miss

1 - 5 DBCDA　　6 - 10 ACBAD