Itiswellknowntousallthatalotof

It is well known to us all that a lot of rivers _______by factories.

A．are polluting	B．have been polluting
C．are being polluting	D．are being polluted

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—If only I__________ morning exercises regularly earlier!
—Yes. Be quick to join us now.

A．do

B．did

C．have done

D．had done

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—Oh, I'd rather you __________.

A．don't

B．hadn't

C．couldn't

D．wouldn't

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—It's time you __________.

A．do

B．did

C．had

D．would

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A．would have passed	B．would pass
C．wouldn't have passed	D．wouldn't pass

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A．drove; didn't get	B．drove; wouldn't get
C．were driving; wouldn't get	D．had driven; wouldn't have got

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