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　　 Trees are useful to man in three very important ways: they give us wood and other products, they also give us shade (阴凉) in summer, and the most important of all, they　 1　 (help) to prevent drought and floods. In many parts of the world, however, people　 2 　　(not realize) the importance of trees to us yet.

　　 Two thousand years ago, a rich and powerful (强大的) country　 3　 down many trees. The trees　 4　 (use) to build warships(战船). It gained the empire (帝国). But without the trees, its soil (土壤)　 5　 　(become) hard anal poor. When empire fell to pieces, the home country found itself faced by floods and hunger.

　　 Even where a government (政府) realizes the importance of forests, it's difficult for it　 6 　villagers see this. The villagers want wood 　7　 (cook) their food with, and they　 8　 (make) money by selling wood to the town people. They are usually too lazy or too careless　 9　 (plant) and look after new trees. So if the government does nothing to control (控制), the forest 　10　 　(disappear) slowly.

1.　　　　 2.　　　　　 3.　　　　　 4.　　　　 5.　　　　　

10. There are　　　　 (较少的) apples in this basket. I prefer that one.

9. He was so careless that he wore different socks on his　　　 (脚).

8. --May I　　　　 (借) your dictionary'? I left mine at home.

　 --Of course. Here you are.

7. In order to get to the nearest village, we have to walk　　　　 (穿过) a forest。

6. Everyone should try to be　　　 (有礼貌的) and helpful to others.

5. Liqun Supermarket is always c　　　　 with people every day.

4. The picture often r　　　 me of my School days.

3. The Clarks didn't stay at home last Sunday. I　 　　　they had a picnic in the park.

2. I'll do it a　 　　to your instructions.