Don’t laugh ___ others.You should help them when they are in trouble.A.at B.to C.of
The policeman asked the child ________ cross the street ________ the traffic lights turned green.
—I called you last night, but no one answered me. —Oh, I________ a shower.
I have _____ decided when to leave, but my sister hasn’t decided_____.
—Do you know _____? — Sorry, I don’t. But I saw her just now.
—Are you worried about the coming exam? —No, I think the more ________ you study, ________ mistakes you’ll make.