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Choose the best response from A to E. ( )1.How often do you write to your parents? ( )2.Must we come here tomorrow? ( )3.Could you please do me a favor? ( )4.What should we do to keep our bodies clean? ( )5.Why not to cycling this Sunday? A. Yes, we must. B. Good idea. C. Three times a month. D. We should take a bath often. E. Sure. What is it?