B) 根據(jù)句子意思，用括號中所給單詞的適當(dāng)形式填空。

1.The____ (pollute) air and water are harmful to people’s health.

2.Is there any____ (possible) that you’ll be back by the weekend?

3.The bus was too____ (crowd) for us to get on.

4.There are some____ (risk) with this method, so certainly do not try this at home.

5.The machine has two serious____ (advantage), so we must find some ways to improve them.

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