根据汉意或首字母提示完成句子。

1. The prisoners a______ to escape, but failed.

2. I have an important ______ (约会) at 3 p.m.

3. I'm very a______ about my son's health.

4. There would be too many people in the ______ (交响乐) hall.

5. Getting this contract is c______ to the future of our company.

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