—This returned Chinese scholar has become one of the top experts in this field .
—Yes , I know him very well . He in Africa with wild animals for eight years .
| A．has worked | B．had worked | C．worked | D．has been working |
The temperature is high enough ________water into vapor(蒸汽)．
| A．to be changed |
| B．changing |
| C．to change |
| D．changed |
There is no good for the parents to provide everything________their children.
| A．with |
| B．for |
| C．to |
| D．by |
Wait until you are________in.
| A．permitting to come |
| B．permitted to come |
| C．permitted coming |
| D．permitting coming |
He said he would keep________the school rules and keep________smoking.
| A．up; down |
| B．from; to |
| C．out; away from |
| D．to; off |
One of the advantages of living on top floor of a high rise is that you can get a good________.
| A．sight |
| B．scene |
| C．view |
| D．look |