题目内容
4. It's polite (give) a seat to others on the bus.
5. The Class 1 students (help) the old people do some cleaning now.
4. to give 5. are helping
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题目内容
4. It's polite (give) a seat to others on the bus.
5. The Class 1 students (help) the old people do some cleaning now.
4. to give 5. are helping