Câu 1. They decided to go out. It rained heavily. (Although)
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Câu 2. Why don’t we go to school by bike instead of motorbike to save energy? (I suggest)
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Câu 3. The flowers are rose. I bought them for my mother. (which)
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Câu 4. The boy is standing near the tree. He is my brother. (who)
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