The policemen had no ______ in finding the knife that the murderer had thrown.
The children are seldom encouraged ________up late at night preparing their lessons,if ________.
Though great efforts have been ________on her study,Annie can’t still make any improvements,which makes her parents greatly________.
The population of the city ________from less than half a million in 1949 to over two million.
—I’m going to the office.—________ you’re there,can you get me some stamps?
—Did you hear that Tonna took social management as her major?—Yes,but she shouldn’t have,you see.This kind of subject ________one’s communication ability,and that’s what she is most weak at.