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16.Dont throw waste paper on the ground, please. （保持原句意思） You ___________ ___________ to throw waste paper on the ground. 17.Its about ten minutes walk from my home to my school. (对划线部分提问) ___________ ____________ is it from your home to your school? 18.Mary had a wonderful time with her family at Christmas.（一般疑问句） __________ Mary __________ a wonderful time with her family at Christmas? 19.The university has achieved new progress since six years ago.（划线提问） __________ __________ has the university achieved new progress ? 20.I dont know when we shall start the work.（简单句） I dont know when ___________ ___________the work. 21.Tom cant speak French. Jack cant speak French, either.（句意不变） __________ Tom __________ Jack can speak French. 22.Mike will come if you invite him（句意不变） Mike __________ come __________ you invite him. 23. Peter often has bread for his breakfast. (改为否定句) Peter ___________ ___________ bread for his breakfast. 24. I have already received some Christmas cards from my friends. (改为一般疑问句) | 
