Many thousands of years ago, there were no houses such as people live in today. In those ancient (???) (1), men some times (2) their homes in trees, using the leaves to keep (3) rain and sun. Their object in building their houses in trees is to be (4) from their enemies and from wild beasts. (5) people in those old times had been more civilized (?? ), they would have had stronger building (6) than the leaves and branches.In colder countries, the people of long ago (7) to live in caves. It was too (8) and stormy to live in trees. Sometimes, across the opening of the cave they made a (9) of stones, in order to (10) out wild animals.

As years went on and the human race (11), men learned more about living in comfort and safety. They became more civilized and (12) woods and caves. They built houses of different materials such as mud, (13) or stones.

During the (14) hundred years, many new building methods have been (15). One of the most recent discoveries is to (16) steel as building material. Nowadays, when it is necessary to make a very tall building, the frame (??) of it first built of steel, and then the building is (17) in concrete (???).But (18) building it may be it should be (19), airy, and comfortable. For a human being cannot keep (20) without sunlight and fresh, clean air to breathe.

1. A. places

B. times

C. years

D. countries

2. A. moved

B. kept

C. settled

D. made

3. A. up 

B. from 

C. off

D. on

4. A. prevented

B. separated

C. safe

D. far

5. A. If

B. Whether

C. Though

D. When

6. A. methods

B. models

C. places

D. materials

7. A. were

B. wanted

C. used

D. began

8. A. cool

B. cold

C. windy

D. warm

9. A. room

B. ceiling

C. wall

D. door

10. A. drive 

B. send

C. find

D. keep

11. A. improved

B. progressed

C. moved

D. changed

12. A. liked

B. broke

C. left

D. kept

13. A. steel

B. iron

C. glass

D. wood 

14. A. first 

B. last 

C. next 

D. following

15. A. done

B. founded

C. discovered

D. formed 

16. A. find

B. make

C. get

D. use

17. A. painted

B. built

C. ended

D. completed

18.A. whichever

B. wherever

C. whatever

D. whenever

19. A. straight

B. beautiful

C. heavy

D. light

20. A. healthy

B. right

C. working

D. on

    KEY: 1-5 BDCCA   6-10 DCBCD   11-15 BCDBC   16-20 DDCDA