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.
Playing on the football pitch __________.
With the development of the Internet, e-mail has largely __________ the traditional business letter.
I won't buy this iPhone unless the price __________ to under 2,000 yuan.
Since we have made __________,we have to make __________ to achieve more.
Now many people move into cities in order to have their children __________.