The boy talked his mother ________ buying him a home computer.
| A．of | B．over | C．to | D．into |
The cars in the auto show vary ______ price from $ 100,000 ______ $ 2 million, but they have attracted many customers.
| A．in; to | B．with; and | C．of; with | D．from; to |
I was told that although these old buildings _______ the Qing Dynasty, they remained in good condition.
| A．are dated back to | B．dated back to |
| C．dating back to | D．have dated back to |
It was Alice and her friends who helped the homeless old woman,______?
| A．wasn’t it? | B．wasn’t she | C．didn’t they? | D．weren’t they? |
He felt _______ to remind the public to protect the environment.
| A．his duty | B．that is his duty | C．it his duty | D．it is his duty |
The research they had been devoted to ______ to be of great value to the cancer patients.
| A．is proved | B．proves | C．has proved | D．proved |