I _____clean the table before dinner.A.have to B.has to C.have

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• The child was running in the street when he (_)(fall)to the ground.she(_)(write)a letter when i went to her house.I (_)(hear)the story before you told it to me.after he (_)(wash) the dishes,she began to clean the table.
• 1.It is as pleasant ____day as I have ever spent.A.a B.the C.\ D.an2.Hundreds of jobs____if the factory closes.A.lose B.will be lost C.are lost D.will lose3.He ____in this college for five years before Icame here to study.A.has been B.had been C.have been D.is studying4.How____can you finish the drawing?A.often B.soon C.long D.rapid5.---_____the blackboard ,Mary?---It is your turn.I did it yesterday.A,cleaning B.you clean C.to lean D.don't clean第五题Mar
• I _____clean the table before dinner.A.have to B.has to C.have
• 现有t℃时的硝酸钾溶液50克,将它加热蒸发掉10克水后温度重新降到t℃,结果有1克晶体析出.取出其中的晶体,再加热蒸发掉10克水并降温到t℃,结果又有3克硝酸钾晶体析出.
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