-must we clean the room right now? -no,you___.YOU____clean it after lunch Amustn'

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• 1.i am busy now,so i can't help____the machinea.to repair b.to have repairedc.repairing d.fixing2.we agreed____here but so far she hasn't turned up yeta.having met b.meeting c.to meet d.to have meet3.go on___the other exercise after you have finished this one.a.to do b.doing c.with d.to be doing 4.mike,you must get your study room ___after lunch.a.being cleaned b.to clean c.cleaning d.cleaned都要告诉我原因的
• A:_____ B:I have to clean the room first A:And then B:_____ A:What about me B:Oh,let me see.___A:_____ B:I have to clean the room first A:And then B:_____ A:What about me B:Oh,let me see.___A:May I go to the park after that?B:I`m afraid not.____A:Oh,I see.___B:I think so .Now let`s come to do our thingsA:OKA:then I must go shopping B:But I think it`s important that we go to the park to have funC:What do we have to do today?D:You have to practice the p
• -must we clean the room right now? -no,you___.YOU____clean it after lunch Amustn'
• 将句子改为被动语态1.My friend saw her go out ten minutes ago.2.We must plant more trees in this city.3.The girl didn't look after her little brother.4.Jane's teacher makes her clean her room once a day.5.Have you written down all the words?6,Mr.Smith will give an English lesson for children on TV.7.Did the librarian ask you to read the book?8.People take good care ofchildren here.9.What did she say at the meeting?10.They're repairing that car now.
• -must we clean the room right now? -no,you___.YOU____clean it after lunch Amustn'-must we clean the room right now?-no,you___.YOU____clean it after lunchA mustn't mayB need't mustCmustn't canDneedn't may选什么?为什么
• 当外力迫使分子靠近,是分子的距离小于10的-10次方m时,斥力大于引力
• 土壤的成分是什么?土壤中的元素是什么?组成物质是什么?无机的.土壤分好几种,每一种的成分及组成比例都应该不同的吧!氧硅在地壳中的含量最高，土壤理的元素是怎么组成的？是硅酸盐，还是其他？当然我指的是大量的，那些稀土元素就不算了！