The rivers will become dirtier and dirtier ________ we take actions to protect them.
A.since B.if C.until D.unless
When I got back, I found my mother________ for me.
A.was cooking B.is cooking
C.cooks D.cooked
She often parks her car near the house which she can easily get to.(英译汉)
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I know the lady who is singing over there.(英译汉)
________________________________________________________________________
I hate the dog that lives in the next house.(英译汉)
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(2009河北41题)Sorry, we don't have the coat ________ you need.
A.what B.who C.whom D.which
