5. 在面试中，我由于紧张声音发抖。(tremble)

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4. 电话系统瘫痪了，因此我无法接通。(break down)

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3. 食物对生命是必不可少的。(essential)

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2. 在过去的三十年里，我的家乡发生了很大的变化，呈现出新面貌。

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1. 那个杀人犯被判处终身监禁。(condemn)

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5.Antarctica’s future is important for us all.Now,however,man’s never ending their 　________ 　minerals threatens the ecosystem there.

4. By his next birthday, he　 ________　 for ten years.

3. Snow White, though written more than a century ago,still　 ________　 children all around the world.

2. The computer system　 ________　 suddenly while he was searching for information on the Internet.

1. -What problems might children have when their parents　 ________?

-They might have emotional and psychological problems.