Environmentalists urged that more effective measures ___________by the government to reduce the pollution.

He suggested the person referred ________ put into prison.

Kunming is called “Spring City”, but it _____ snow in winter.

－ What does the sign over there say?－ “No person ____________ bring drinks into the student computer pool.”

If it were not for the fact that she_______sing, I would invite her to the party.