閱讀下面材料，在空白處填入適當?shù)膬?nèi)容（一個單詞）或括號內(nèi)單詞的正確形式。

Animals have been killed for their fur and feathers, and 1. (thousand) of kinds of animals have disappeared from the world forever. About 170 kinds in the US alone 2. (consider) in danger.

Why should people care? 3. we need animals, and if they are gone, there will never be any more. Every animal has its place in the balance of nature. 4. (destroy) one kind of animal can create many problems. For example, when farmers killed large numbers of hawks (老鷹), the farmers’ stores of corn and grain were destroyed 5. rats and mice. With no hawks to keep down their numbers, the rats and mice multiplied (繁殖) 6. (quick).

Luckily, some people are working 7. (help) save the animals. Some groups raise money to let people know about 8. problem. And they try to get the governments to pass laws protecting animals in danger. Quite a few 9. (country) have passed laws. These laws forbid the killing of any animals on the danger list. Slowly, the number of some animals in danger 10. (be) growing.

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Texting (發(fā)短信) is nearly universal among people with cell phones. While texting can be a great way to stay in touch and to share the feelings of daily life, it sure has a downside. 1. Read on to learn why it is time to put the phone down — even if it’s just for an hour or an afternoon.

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