The findings of the research, _________ on a lot of experiments, are convincing.
| A．to base | B．based | C．is based | D．basing |
----May I open the window to let in some fresh air?
—— . (2009 .四川)
| A．Come on |
| B．Take care. |
| C．Go ahead. |
| D．Hold on. |
----Could you be so kind as to close the window?
---- .（2009 .安徽）
| A．With pleasure. |
| B．Go ahead. |
| C．Yes, please. |
| D．That’s OK. |
----Are you going to Tom’s birthday party?
----I might have to work.（2011 .山东）
| A．It depends. |
| B．Thank you |
| C．Sound great. |
| D．Don’t mention it. |
Sit down, Emma. You will only make yourself more tired,on your feet. (2011 .北京 )
| A．to keep |
| B．keeping |
| C．having kept |
| D．to have kept |
More highways have been built in China,it much easier for people to travel from one place to another.（2011．陕西）
| A．making |
| B．made |
| C．to make |
| D．having made |