e than ten _______ for each piece of its glass.Р A. levels B.stories C.layers D.formationsР16.The thief was _______ by the police at the railway station.Р A.carpet B.mined C.captured D.mountedР17.In fact, there is no _______ liberty in any country.Р A.adequate B.absolute C.private D.practicalР18.There is too much noise outside. I can not _______my attention on my work.Р A.connect B.flat C.fill D.concentrateР19.While studying at U.C.L.A.,Mr.Wang _______ his old friend, whom he has not seen for nearly twenty years.Р A.encountered B.whispered C.swung D.maidР20.The _______ production of engines in our factory has doubled this year.
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