Kết hợp 2 câu thành 1, thay đổi câu đầu tiên thành cụm danh từ kết hợp với mệnh đề quan hệ.

1. The dam was holding back the water. Then it suddenly gave way.

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2. Some buildings were hit by bombs. They are still burning.

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3. Some people want to smoke. They have to leave the building.

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4. A plane crashed into the sea. It may have been a terrorist target.

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5. A shot was fired that day. It signaled the start of the American Revolution.

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