______he sing an English song? –No ,he can’tA. Is B. Does C. Can
_____ the environment is important for human beings.
I can’t stand _____ for you so long.
—Is the bag beautiful? —Yes, at _____ it’s _____ the one you bought for me.
Our teacher told us that light _____ much faster than sound.
In our class _____ of the students _____boys.