题目内容
根据英文提示写出单词，完成句子。（每空一词）
81. It’s polite to knock on the door before ▲ (enter) the room.
82. Each time you answer a question ▲ (correct), you can get one point.
83. It is wrong to throw so many ▲ (die) pigs into the Huangpu River.
84. The Chinese people should remember the terrible thick fog in Beijing. We must try our best not to make the air ▲ (pollute).
85. The ▲ (busy) mean the organizations that sell goods and services to make money.
entering; correctly; dead; polluted; businesses
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