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翻译参考答案如下：
1. They had a ball, but I was not in it.
2. We were having a ball when we toured Beijing.
3. We are happy to hear you having a ball.
4. We are having a ball, but the sound troubles my neighbours.
5. No one danced until Charles and Mary broke the ice by going out on the floor;from then on, everybody had a ball.
6. I'm glad that you are having a ball, but you are making too much noise.
