-Is _____ ready for a dinner?-No,the table hasn't been set yet.

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• -Is _____ ready for a dinner?-No,the table hasn't been set yet.A.anythingB.everythingC.somethingD.nothing
• -Is _____ ready for a dinner?-No,the table hasn't been set yet.
• ( )1.John and Bob often talk____the phone.A.in B.on C.at D.inside ( )2.When mum makes the dinner ready,we____set the table.A.must B.can C.should D.may ( )3.Let's take the____boy home or hospital.A.sick B.ill C.good D.bad ( )4.The restaurant is too expensive.____choose a cheaper one?A.Why not to B.Why don't C.Why not D.Why not you ( )5.You____late for school again if you ____early.A.shall be;won't get up B.are;won't get up C.will be;don't get up D.have
• -do you know mr.smith?
• 已知数列an为等差数列a1=2,a1+a2+a3=12(1).求an和Sn(2).求1/S1+1/S2+1/S3+…+1/S10