【2015·四川】The exhibition tells us____we should do something to stop air pollution.
.My friend, Lucy can get 200 dollars more than she made___________in the primary school.
.___________is hard is to do good all one's life and never do anything bad.
.—What are you busy with?—The conference___________in our city next week, as you know.
.Just because they make more money than I do, ___________they seem to look down on me.
.—I’ve never found a better job and I’m so glad.—___________.