John, _______ university professor, is considered to be _______ success as ______ expert in the agriculture research.
| A．a; a; an | B．an; / ; an | C．the; /; an | D．a; the; an |
Don’t come in unless ________.
| A．inviting | B．inviting to | C．invited to | D．being invited to |
Many difficulties have ______ as a result of the overuse of coal
| A．risen | B．arisen | C．raised | D．arose |
There is no doubt _____ she will be able to repay the money on time.
| A．that | B．which | C．whether | D．why |
_______ his scientific work, he has no time to care for his family affairs, which his wife always complains about.
| A．Devoting to | B．Devoted to | C．Being devoted with | D．Devoted with |
- ______ Tom to be fit for the office, the boss ______ taking him on.
| A．Consider, considered | B．Considering, considering |
| C．Considering, considered | D．Considered, considering |