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Sandy is sure that the mystery cleaner must be ..描述猜测的原因：offer help,be known for,helpful nature,be always ready to lend a hand,have a habit of表达依然存在的困惑：The truth still remains a mystery.【范文展示】Everyone is surprised to see the clean and tidy classroom on Monday morning.They all wonderwho did the cleaning last Friday.Different students have different opinions about it.Frank believes it could be George,a member of the volunteer club who often offers helpwhenever he can.Emily,on the other hand,has her doubt.She thinks it might be Maria,a girl whois known for her helpful nature and is always ready to lend a hand.Sandy is sure that the mysterycleaner must be Sarah because she has a habit of staying behind after school to finish herhomework.Perhaps,after completing her homework,she cleaned up the classroom.The truth still remains a mystery.However,whoever it is,his kindness not only warms ourhearts but also encourages us to do nice things for others.。