—What’s wrong with my computer, Jack?—Let me have a check. OK, it works now.—You mean, nothing wrong with it, ________ ?
Americans eat____ vegetables per person today as they did in 1990.
Students ______ remain in their seats until all the exam papers have been collected.
The atmosphere of the earth ______ us from the strong sun light.
---How well did John do in the match? --Wonderful. I think we can’t have a ______ player in our football team.
Many countries are increasing their use of natural gas , wind and other forms of ______.