IV.连词成句将所给单词连成句子。要求符合语法，语句通顺，大小写正确，单词不得重复使用，标点已给出。1. hard it's stop to ride .2. are to save the earth we try .3. air is the polluted bad .
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【答案】 1. It's hard to stop riding.
2. We are trying to save the earth.
3. The air is badly polluted. /The air is polluted badly.