It is our duty ______much attention to ________ our best to keep our city clean.
| A．to pay, trying | B．paying, trying |
| C．pay, try | D．to pay, try |
—Mary can't help ______ the house. Why?
—Because she is busy______ a hotel reservation.
A. cleaning; makingB.to clean; makingC. cleaning; to make
—Sorry, I can’t go to the theater with you ____ next Saturday, because I have ____ homework to do.
—It doesn’t matter.
A. on; too muchB. /; much too C. /; too much
一_______ will the foreign students be back from Tibet?
一In two weeks．I think．
A. How soon B. How far C. How long
— He hardly hurt himself in the accident, did he﹖
—_______ He is always careless.
A. No, he did. B. Yes, he did. C. No, he didn’t.
一Have you ever been to the new clothing shop _____is just opened?
—Yes. I went there yesterday.
A. what B. where C. that