题目内容
根据句意和汉语注释,写出单词的正确形式。
1.We should try our best to protect our ________________(环境)
2.The old man and old woman are a happy ______ (一对).
3.English is a kind of _____________ (国际的) language.
4.My uncle often goes to London on ________ (商业)
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