---I have been to Qingdao before.
----- .
| A．So I did |
| B．So I have |
| C．So did I |
| D．So have I |
－Dirty water shouldn’t be poured into rivers.
－_______. It will cause pollution.
A. Don’t say like this B. Never mind C. I agree with you
—My old friend White is going to visit me.
—We haven't seen each other_____ five years.
A. since B after C. for
________is dangerous for us to swim in the river alone.
A. It B. That C. This
Dear students, please read every sentence carefully. The more _____ you are, the______ mistakes you'll make.
A. careful; fewerB. careful; less C. carefully; fewer
______ trees were cut down. And many birds lost their home.
A. Two thousandsB. Thousand of C. Thousands of