Only those who have experienced hardship ____ well aware of what happiness means.
| A．can they be | B．they can be | C．can be | D．they can |
When I was at school, I _____ up very late, reading storybooks.
| A．used to stay | B．was used to stay |
| C．used to staying | D．am used to staying |
Could I speak to ____ is in charge of International Sales, please?
| A．anyone | B．someone | C．whoever | D．no matter who |
—Is there any news about my promotion?
—I regret _______ you that we’ve chosen someone else for the job.
| A．telling | B．to have told |
| C．to tell | D．to be telling |
One side of the board should be painted yellow, and _______ white.
| A．other | B．the other | C．the others | D．others |
—Are you guys ready for “The Campus Singers Competition”?
—Sure！Since we are young, try it, _____ we will regret!
| A．and | B．but | C．or | D．then |