A．教育的终身化和全民化B．教育的民主化C．教育的多元化和教育技术的现代化D．教育的法制化20世纪以后教育的新……

单项选择题About 70 percent of the population ______ in that country in the mountains and only 30 percent of its land ______ farmland.

单项选择题—You'd better ______ work too hard like this. —I see. You mean ______ too hard makes one tired and ill.

单项选择题So far nobody has claimed the money （） in the library.

A. discovered
B. to be discovered
C. discovering
D. having discovered

单项选择题They used to quarrel a lot, but now they are completely ______ with each other.

单项选择题We （） on this project for four hours. Let's have a rest.

A. are working
B. have been working
C. worked
D. had worked