can learn how to surf the Internet safely and effectively in computer lessons.

May I play computer games now — No, you______. You _______ finish your homework first.

s a very convenient place to live in,is an airport connecting all the big cities

ge is an especially important stage for us, ______we are supposed to go all out to improve ourselves because anything can happen.

hanging lanes , a driver should use his turningsignal to let other drivers know .