Itissaidthatsixtypercentofalle

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It is said that sixty percent of all energy ________ in the world today is being lost as wasted heat.

A．produced	B．producing
C．to produce	D．having produced

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Don’t bother Tom, he is ______ with the experiment on water molecules in the lab.

A．focused

B．fixed

C．occupied

D．concentrated

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Nowadays some parents regret not ______ more time with their kids when they were young.

A．to spend

B．spending

C．spend

D．being spent

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Have you heard that he, as well as his parents, ______ visited the Summer Palace?
—Really? No ______ he didn’t attend the meeting.

A．have; doubt

B． has; choice

C．have; reason

D．has; wonder

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Only ______ a human being.

A．when is it hungry a lion will attack	B．when it is hungry a lion will attack
C．when it is hungry will a lion attack	D．when is it hungry will a lion attack

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Don’t ______ a person only because he has failed in an examination.

A．look up

B．look down

C．look down on

D．look up to

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