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.

Why shouldn’t I disturb my brother these days?—Because he needs to think aboutjob advertised in the paper he can take.

we must ___ to the public the simplefact that drug are dangerous

Who called just now, Sam—It’s Mona. She asked _____.

The young scientist has made such great achievements in his chosen field ______ nobody else can make.