______ their homework, these three students have to stay in the classroom for another thirty minutes.
| A．Not finishing | B．Not finished |
| C．Having not finished | D．Not having finished |
The experiment shows that proper amounts of exercise, if regularly, can improve our health.
| A．being carried out |
| B．carrying out |
| C．carried out |
| D．to carry out |
This coastal area a national wildlife reserve last year.
| A．was named |
| B．named |
| C．is named |
| D．names |
The boy disappeared in the village five years ago and he ever since.
| A．was not heard of |
| B．is not heard of |
| C．hasn’t been heard of |
| D．hadn’t been heard of |
We've had a good start, but next, more work needs ________ to achieve the final success.
| A．being done |
| B．do |
| C．to be done |
| D．to do |
——Have you heard about that fire in the market?
——Yes, fortunately no one .
| A．hurt |
| B．was hurt |
| C．has hurt |
| D．had been hurt |