The boy is often heard _____in the music room. He sings very well.
A.practice singing
B.to practice singing
C.practiced singing
Animals are our close friends. We are supposed _____ them.
A.to protect
B.protecting
C.protect
The Great Green Wall can stop the wind and sand_____ to the rich land in the south of China.
A.move
B.to move
C.from moving
—Excuse me. Could you tell me ____get to the nearest post office?
—Sorry, I am new here.
A.how can I B.how I could
C.how to D.what I can
He promised _____his old friend during his stay in Tianjin.
A.see B.seeing C.saw D.to see
—What a heavy rain!
—So it is. I prefer ____ rather than ___on such a rainy day.
A.to go out; stay at home
B.to stay at home; go out
C.going out; stay at home
D.staying at home ; go out