Bytheyear2020scientistsalotofr

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By the year 2020 scientists _____ a lot of research on AIDS.

A．had done

B．do

C．are doing

D．will have done

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________ I accept that Tom is not perfect in many respects, I do actually quite like the man.

A．When

B．Because

C．Until

D．While

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– Have you got enough money for the rent?
– I don’t know, but ______

A．So what?	B．I hope so.
C．What a relief!	D．I’d rather not.

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decision

A．possession	B．revision
C．expression	D．discussion

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extra

A．exercise	B．exact
C．explore	D．extreme

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secure

A．official	B．grocery
C．encourage	D．ocea n

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