短文填空
请用适当的词完成下面的短文，并把所缺单词填写在答题卡指定的位置上。每个空只能填写一个形式正确、意义相符的单词。
Trees are useful to man in three very important ways. The first important way is that they provide man ____1____ food, wood and other products(产品). Trees provide man and animals with food to live ___2___ the earth. It’s not easy ____3_____ man to live on the earth without trees.
The ____4_____ important way is that trees give us shade(树荫). On a hot summer day, people can have ____5_____ rest under the shade of a tree after they have walked a long way. You can imagine（想象） ___6_____ important the shade of a tree is to man and animals.
The third important ____7_____ is that trees help to prevent droughts（干旱）and floods. However, in many parts of the world, man has ____8_____ realized the third important way. He has cut ____9_____trees in large numbers. ___10_____ the end, he finds that he has lost his best friends.
1. 2. 3. 4. 5.
6. 7. 8. 9. 10.