—Dear son，I will take you to the big dinner tonight. _________You promise.
—OK. Mummy.
| A．Believe yourself | B．Behave yourself |
| C．Enjoy yourself | D．Help yourself |
________ I know, the new airport runway has been under construction for nearly two years.
| A．As long as | B．So long as | C．As far as | D．So far for |
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 |