________ makes the book so extraordinary is the creative imagination of the writer.
| A．That | B．What |
| C．Who | D．Which |
-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 |
The lion is considered king of the forest as it is a（n）__________ of courage and power.
| A．example | B．sign |
| C．mark | D．symbol |
Our enlarged school campus is __________ the old one.
| A．as three times big as | B．three times as big as |
| C．bigger three times than | D．as big as three times |