When men lived on this earth a long time ago, they had no proper place to live in. In order to get 　16　 from the heat of the sun, to 　17　 themselves warm and dry, they found caves which gave them 　18　 kind of protection. Some of this early men built shelters up 　19　 the trees to escape crawling animals. They 　20　 difficult lives and had to 　21　 about from place to place 　22　 search of food.

Much later on their 　23　 began to change. They learnt how to keep animals in herds. 　24　 they had to move their herds of　 25 from place to place in search of pasture or grasslands, they had to build sheds which 　26　　 be easily carried about. Animals skins were 　27　 over pieces of wood which provided them with some form of temporary (临时)　　　 28　 .

When they finally learnt the art of ploughing, they started cleaning forests or brush lands and planting 　29　 which provided them with fruits, vegetables and grain. 　30　 this happened they had to think about building 　31　　 .

Crude houses were built at first with wood 　32　 they even used grass as roofs. This 　33　 on for a long time. Gradually they began to improve their homes. Today houses of all 　34　 are built. They are strong , permanent (永久性的) and 　35　 last a long time.

16.A. in　 B. out　 C. away　 D. off

17.A. keep　 B. make　 C. get　 D. help

18.A. any　 B. some　 C. one　 D. the

19.A. on　 B. into　 C. in　 D. above

20.A. led　 B. made　 C. kept　 D. suffered

21.A. walk　 B. travel　 C. run　 D. move

22.A. to　 B. in　 C. for　 D. on

23.A. lives　 B. work　 C. ways　 D. food

24.A. After　 B. Before　 C. When　 D. As

25. A. animals　 B. cows　 C. sheep　 D. horses

26. A. could　 B. must　 C. needed　 D. should

27. A. laid　 B. kept　 C. made　 D. hung

28. A. cave　 B. shed　 C. shade　 D. bed

29. A. trees　 B. rice　 C. crops　 D. wheat

30. A. Before　 B. Until　 C. Once　 D. When

31. A. shed　 B. houses　 C. gardens　 D. schools

32. A. but　 B. and　 C. thought　 D. yet

33. A. took　 B. lasted　 C. continued　 D. went

34. A. kinds　 B. sizes　 C. lengths　 D. colors

35. A. could　 B. would　 C. must　 D. can

15. We all know the truth______the earth goes round the sun.

A. if　 B. whether　 C. that　 D. which

14. His health________from overwork.

A.has been broken down　 B. has broken out　

C. has broken down　　　 D. has been broken up

13. Will you please send me a (n)_______to your new micro-computer?

A. introduction　 B. description　 C. advertisement　 D. information

12. With many eyes______on her , she felt a bit nervous.

　 A. depended　 B. starting　 C. glaring　 D. fixed

11. ________to 45% of the supermarkets in the city______ by foreign companies.

　A. Close ; run　 B. Up ; are run　 C. Up ; is run　 D. Next, have run