一、单项选择(共15小题;每小题1.0分,满分15分)In ____ 1980s, great changes have taken place in ____ China.
Comparison may make something appear more beautiful than it is when _____ alone.
—What do you do, Rita? —I’m a clerk in a foreign company now.But I _____ English in a high school for 10 years.
—How are you getting along with your German, Kate? —Oh, Mr.Black, I’m so tired of it.Maybe I should drop out _____ it kills me.
A public health campaign _____ the number of heart disease deaths by 80 percent over the past three decades.
If it _____ earlier, the printing machine would not have broken down.