_____ of the water _____ polluted. We must try to protect our environment.

you see it with your own eyes, Mike— Yes. Otherwise I _______you about it.

The old lady lives ______ in a ______ house, butshe doesn’t feel _____.

下列文学常识表述正确的一项是

______ our teacher was ill, ______ she still came to our class to teach us.