Mr. Lee, who as a guide for over 10 years, is now a manager in a big travel agency.
| A．worked | B．has worked | C．had worked | D．works |
Three years ago in Beijing, my best friend, David, was hit by a car while riding a bike, _______ a terrible brain injury.
| A．caused | B．to cause | C．causing | D．being caused |
The rise in wood fuel use has _____ the disappearance of forest and the loss of habitats for pandas.
| A．belonged to | B．adapted to | C．devoted to | D．contributed to |
----Tom, you do the cleaning after school, ________ you?
---- Me again? But I did the cleaning yesterday!
| A．do | B．don’t | C．will | D．did |
Stand over there, ___ you’ll be able to see the oil painting better.
| A．and | B．till | C．but | D．or |
Never before in China __________ so carefully concerned about the food safety.
| A．people have been | B．have people been | C．are people | D．people are |