He wouldn’t give up smoking _______ his doctor told him it was a matter of life and death.
To keep healthy, Professor Johnson ______ cycling as a regular form of exercise after he retired.
One way to understand thousands of new words is to gain _____ good knowledge of basic word information.
It was announced that only when the fire was under control ____ to return to their homes.
The driver _____ for the accident had not been driving carefully.
You should read the _________ in the car repair manual (手册) carefully before you start to work on it.