The old __.
| A．have to take good care of | B．was looked after very well |
| C．have to be taken good care of | D．were had to look after very well |
—Is Bob still working in your school?
—I'm afraid not. He is said ___________ and ___________ in a private school recently.
| A．to resign ； to teach |
| B．to have resigned ； to teach |
| C．to resign ； to be teaching |
| D．to have resigned ； to be teaching |
The ___________ boy was last seen ___________ near the East Lake.
| A．missing ； playing |
| B．missing ； play |
| C．missed;played |
| D．missed;to play |
It was never clear ___________ the man hadn't reported the accident sooner.
| A．that |
| B．how |
| C．when |
| D．why |
It is uncertain ___________ side effect the medicine will bring about，although about two thousand patients have taken it.
| A．that |
| B．what |
| C．how |
| D．whether |
It never occurred to me ___________ you could succeed in persuading him to change his mind.
| A．which |
| B．what |
| C．that |
| D．if |