Mr. Black ________ English in a middle school ever since he came to China.
| A．have been teaching |
| B．has been teaching |
| C．had taught |
| D．taught |
It used to be thought _____ the Earth was flat.
| A．as |
| B．when |
| C．since |
| D．that |
He made _____ known to his friends that he didn’t want to enter politics.
| A．that |
| B．it |
| C．himself |
| D．him |
Why shouldn’t I buy a new coat — I haven’t bought _____ for five years.
| A．it |
| B．that |
| C．one |
| D．which |
I’d appreciate ____ if you would like to teach me how to use the computer.
| A．that |
| B．it |
| C．this |
| D．you |
As the busiest woman in Norton, she made_________her duty to look after all the other people’s affairs in that town.
| A．this |
| B．that |
| C．one |
| D．it |