The young doctor is determined to devote all his life to ________ the cause of cancer.
| A．studying | B．studied | C．study | D．studies |
such heavy pollution already, It may now be too late to clean up the river.
| A．Suffering. | B．Having suffered. | C．To suffer. | D．Suffered. |
The spokesman didn’t make clear why the president failed to attend the conference.
| A．this. | B．that. | C．it. | D．what. |
One may never know the of knowledge without being educated.
| A．power. | B．force. | C．energy. | D．strength. |
This is the first time we a film in the cinema together as a family
I mention it I feel very happy.
| A．see; time | B．had seen; for the time |
| C．saw; the time. | D．have seen; the time. |
Tom’s pay depends on the factory.
| A．he plays in what part. | B．he plays what part in. |
| C．what part he plays in. | D．in what part he plays. |