What’s your telephone number?— 553786.
I don’t know if Mr. Smith ____. If he ___, I will tell you.
He used to __ in a small village, but now he has been used to __ in the big city.
— Could you tell me ______?— Certainly. In half an hour.
If you don’t know the words, you must ______in a dictionary.
—There was thick haze(雾霾)in our city this spring. What do you think of it?—I think __ cars we drive, __ pollution our city will have.