________the problem, he wouldn't have committed those mistakes.
| A．If he understood | B．Had he understood | C．When he had understood | D．If he would understood |
______and happy, Tony stood up and accepted the prize.
| A．Surprising |
| B．Surprised |
| C．Being surprised |
| D．To be surprising |
John received an invitation to dinner, and with his work _______,he gladly accepted it.
| A．finished |
| B．finishing |
| C．having finished |
| D．was finished |
He is very popular among his students as he al-ways tries to make them _______in his lectures.
| A．interested |
| B．interesting |
| C．interest |
| D．to interest |
We all know that, _______, the situation will get worse.
| A．not if dealt carefully with |
| B．if not carefully dealt with |
| C．if dealt not carefully with |
| D．not if carefully dealt with |
It is reported that two young officer gave their life in solving the incident. Don't you think the _______ is too great?
| A．value |
| B．cost |
| C．risk |
| D．challenge |