—The air pollution is terrible.
—It will be worse_____ we take action to protect the environment.
A. if B. unless
C. until D. when
If you can’t find the place, I will show you_______.
A. what it is B. what it was
C. where it is D. where it was
—Would you like to play football after school?
—____. I have a lot of homework to do.
A．I’m afraid not B．Enjoy yourself
C．Take our time D．It takes no time
—Do you have any plans for this Sunday?
—I’m not sure. I ____ go to the countryside to see my grandmother.
A．can B．must
C．may D．need
Drive slowly, Mary. ______ is too much haze(霾) on the road.
A．It B．This
C．That D．There
—What do you think of your Junior Middle School life?
—I think it's colorful, ____ I am always busy.
A．if B．though
C．while D．until
