单项选择题
A. he was driving along a lonely road B. he had taken a stranger in his car C. he saw a police-ear D. he was afraid that the man might rob him
A. They are used to express feelings only. B. They can not be written down. C. They are simply sounds. D. They are mysterious.
A. when you are asleep B. when you recover from your work of the day C. in the next period of activity D. when you are quiet