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1.-I want to see Mr.White.We have an appointment.
-I'm sorry,but he is not ________ at the moment,for the meeting hasn't ended.(  )
A.busyB.activeC.concernedD.available

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20.My room is a mess,but I ______clean it before I go out tonight.I can do it in the morning.(  )
A.daren'tB.shouldn'tC.needn'tD.mustn't

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19.-Albert's birthday is on next Saturday,and I'm planning a surprise party for him.
-__________.I'll bring some wine.(  )
A.Sounds like funB.It dependsC.Just a minuteD.You are welcome

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18.Many people who live along the coast make a living _______ fishing industry.(  )
A.atB.inC.onD.by

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17.People______better access to health care than they used to,and they're living longer as result.(  )
A.will haveB.haveC.hadD.had had

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16.Jim has retired,but he still remembers the happy time _______ with his students.(  )
A.to spendB.spendC.spendingD.spent

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15.The little problems ______ we meet in our daily lives may be inspirations for great inventions.(  )
A.thatB.asC.whereD.when

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14.The national park has a large collection of wildlife,_________ from butterflies to elephants.(  )
A.rangingB.rangeC.to rangeD.ranged

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13.In the 1950s in the USA,most families had just one phone at home,and wireless phones _______ yet.(  )
A.haven't inventedB.haven't been invented
C.hadn't inventedD.hadn't been invented

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12.Many airlines now allow passengers to print their boarding passes online ______ their valuable time.(  )
A.saveB.savingC.to saveD.saved

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