Before going abroad he devoted all he could _______ his oral English.
| A．improve | B．to improve |
| C．improving | D．to improving |
_____________he referred to in his article was unknown to the readers.
|
______________breaks the law should be punished.
|
The government has to close those small factories to prevent the water of the river ______.
|
—Will you go swimming with me this weekend?
—______.
| A．All depend | B．It depends | C．It depends on | D．All depends on |
21.Bob got seriously injured in the traffic accident, but luckily, the doctor came __________to save his life.
| A．in time | B．on time | C．at times | D．at last |