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It's the second time that I ________ to Shanghai.It's ten years since I ________ it last time.
A.have been;left B.had been;left C.am;had left D.come;had left
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The message is very important,so it is supposed ________ as soon as possible.
A.to be sent B.to send C.being sent D.sending
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Einstein like Bose's paper so much that he ________ his own work and translated it into German.
A.gave off B.turned down C.took over D.set aside
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I like getting up very early in summer.The morning air is so good ________.
A.to be breathed B.to breathe C.breathing D.being breathed
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The country has already sent up three unmanned spacecraft,the most recent ________ at the end of last March.
A.has been launched B.having been launched
C.being launched D.to be launched
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At the beginning of class,the noise of desks ________ could be heard outside the classroom.
A.opened and closed B.to be opened and closed
C.being opened and closed D.to open and close
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The steam engine gives us an example of heat ________ into work.
A.turns B.turned C.turning D.being turned
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It is strongly recommended that the machine ________ until it has been fully checked.
A.is not used B.will not be used
C.not be used D.is not to be used
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My morning ________ includes jogging in the park and reading newspapers over breakfast.
A.drill B.action C.regulation D.routine
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Some blood types are quite common,others are regionally ________,and still others are rare everywhere.
A.distributed B.contributed C.obtained D.contradicted
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