In the past twenty years great changes _______in China.
| A．were taken place | B．have been taken place |
| C．have taken place | D．were happened |
Barack Obama and Mitt Romney both say the country's immigration system must be reformed． But they disagreehow to do it．
| A．with | B．about | C．to | D．by |
The old man has a strange way of speaking． Here is a recording of his speech, but no clearof what he has said can be made at all．
| A．sense | B．meaning | C．idea | D．explained |
—Doctor Brown, what's your next project going to be about?
—Well, that remains.
| A．to see | B．to be seeing |
| C．to seeing | D．to be seen |
If I find someone who looks like the suspect, my reaction will be to tell the police．
| A．immediate | B．sudden | C．casual | D．typical |
Now there are some laid-off workers delightedly taking up the work topatients in hospitals．
| A．look on | B．take on | C．wait on | D．feed on |