After the accident，the police spent a week finding out the person who________ it.
| A．witnessed | B．stared at |
| C．proved | D．heard of |
_______the road, be careful.
| A．While crossing | B．When cross | C．Crossed | D．Being crossed |
_______twice, he didn't want to try again.
| A．Failed | B．Failing | C．Having failed | D．To fail |
______a nurse, she knew how to take care of a patient.
| A．Been | B．Being | C．To be | D．Be |
The______ look on his face suggested that he had passed the exam.
| A．exciting | B．tired | C．tiring | D．excited |
As a boy, he was_______ hard all day long.
| A．made to work | B．to make working | C．made working | D．to make work |