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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) ___________ you received ___________ Christmas cards from your friends yet? 25. The small boy stopped crying after he saw his mother.(保持原句意思) The small boy ___________ stop crying ___________ he saw his mother. 26. It took me half an hour to go to the Peoples Square by underground. (对划线部分提问) ____________ ___________ did it take you to go to the Peoples Square by underground? 27. We must protect our earth well. (改为被动语态) Our earth must ____________ ____________ by us well. 28. Mr. Lee studies Chinese in the university. (改为否定句) Mr. Lee __________ __________ Chinese in the university. 29. The children spent fifty per cent of their savings on books. (对划线部分提问) | 
