It remains unknown _____the peace talk between the two countries is going to lead.
| A．why | B．when | C．how | D．where |
Go back home now, Mary. Your parents __________your safety.
| A．are concerned about |
| B．are concerned with |
| C．are concerned in |
| D．concern of |
I did a lot of work on that book. It annoys me that the editor never __________ that.
| A．refused |
| B．acquainted |
| C．acknowledged |
| D．accused |
The form is said to require __________ in black ink.
| A．filling in |
| B．to be filled |
| C．filling |
| D．to fill in |
To keep healthy ,Mr. Lin __________ climbing as a regular form of exercise after he retired .
| A．took up |
| B．took on |
| C．made up |
| D．made in |
-How shall we spend the holiday?
—Well, I recommend __________
| A．to travel |
| B．traveling |
| C．to traveling |
| D．travel |