There is a _________ of 1000 dollars for the return
| A．reward | B．prize | C．thank | D．praise |
. They did everything they could to prevent the pollution ______ the river.
| A．protecting | B．to protect | C．from being protected | D．from protecting |
. Could I have a word with you, mum?
— Oh, dear, if you ______.
| A．can | B．may | C．must | D．should |
. All but one _______ take part in the conference ______ tomorrow.
| A．is going to; that is to take place | B．are going to; that is about to take place |
| C．are going to; that is to be taken place | D．are going to; which is to be held |
The fire was finally ______ after the building had ______ for two hours.
| A．put off; caught fire | B．put away; been on fire |
| C．put out; been on fire | D．put out; caught fire |
. Between the two rows of trees ____ the teaching building.
| A．stand | B．stands | C．standing | D．are |