We are sure one day the air in Beijing will be much ______ than today.
Now Chinese people are living a _________life than before.
Don’t _________ the bus until it has stopped. Safety is first.
I don’t know the girl in red. Could you tell me ________?
— _______ do you go shopping with your mother?— I seldom do that.
—Would you like _______ or shall we go by bus?— I prefer _______,but we have to take a taxi, for time is short.