We must take measures to stop various kinds of pollution ______ the environment gets worse.
| A．unless | B．until |
| C．before | D．when |
In our hometown, about 1，500 meters east of my house，__________ an old temple __________ back to the 17th century.
| A．stands; dating | B．is standing; dated |
| C．standing; dated | D．stand; dating |
Daily expense __________ the normal level last May, and by that time the government had already taken measures to bring down the price of food.
| A．is reduced in | B．was reduced to |
| C．had reduced in | D．has been reduced to |
-If you could reduce the price __________$15，I could increase my order.
-I'm afraid the best I can do is $10.
| A．by | B．to |
| C．at | D．for |
-The cars give off a great deal of waste gas in the street.
-Yes, but I'm sure something will be done to __________ air pollution.
| A．reduce | B．remove |
| C．collect | D．warn |
__________ either you or I to look after her?
| A．Am | B．Is |
| C．Are | D．Should |