7.Althoughthecausesofcancer，we

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7.Although the causes of cancer ____， we do not yet have any practical way to prevent it.

A．are being uncovered	B．have been uncovering
C．are uncovering	D．have uncovered

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As for the accident this time, I think it is Richard you, to blame.

A．more than; are	B．less than; who are
C．rather than; that is	D．rather than; is

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On ________ our flight would be delayed, we made some other arrangements.

A．being informed	B．informed
C．informing	D．having informed

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I want to be liked and loved for _______ I am inside.

A．who

B．where

C．what

D．how

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A．not allowing	B．not being allowed
C．not allowed	D．having not being allowed

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The thief used a ladder that had been ______ by some workmen, and climbed over the wall.

A．left aside

B．left behind

C．left off

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