-The terrible accident might not have happened had the driver been more careful.
--But he _____.
| A．wasn’t | B．didn’t | C．hadn’t | D．doesn’t |
Scientists are convinced ___________ the positive effect of laughter ___________ physical and mental health.
| A．of; at | B． by; in | C．of; on | D．on; at |
Those who are not _______ with the progress they have made will work harder.
| A．proud | B． afraid | C．popular | D．content |
He was in the mountain for a year. He felt as if he was ________ from the outside world.
| A．cut out | B．cut in | C．cut off | D．cut up |
No matter where he is, he makes _________ a rule to go for a walk before breakfast.
| A．him | B．this | C．that | D．it |
There is no point arguing about what ________ the accident. I’d rather you _________ the victims of it.
| A．led to; focus on | B．led to; focused on |
| C．caused; focus on | D．caused to; focused to |