---Mum, I’m going for Jim’s birthday party. I’ll be back before 9:00.

---_________.

A. Have great fun B. Be careful

C. Come home early D. Really?

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Spending two or three hours playing outdoors each day can reduce the chance of becoming short-sighted(近視), a research shows. It challenges the belief(信念) that short-sightedness is caused by computer use, watching TV or reading in weak light.

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