— Who looks _________ your little sister? — My grandparents. A. after B. at C. with
—I’m sorry I’m late, Mr. Green.---“It doesn’t matter this time, but please come here a little______ next time.” Mr. Green says _______ smile on his face.
The air in the country is ________ than ______ in the big city.
________ people can use computer in the old days.
The number of the books in our school library _______ about50,000.
Something terrible _______him these days. Do you know what’s wrong?