—Will you go to the party?
—Of course I will .
| A．if invited | B．if having been invited |
| C．if I was invited | D．if to be invited |
______ it is to listen to music when you are free.
| A．What fun | B．What a fun | C．How fun | D．How funny |
—What are you going to do this weekend?
—_______. If time permits, I may go to Shanghai with my friends.
| A．Don’t mention it | B．It doesn’t matter | C．It depends | D．Forget it |
I hope there are enough glasses for each guest to have ______.
| A．it | B．those | C．them | D．one |
Professor Smith, along with his assistants, _____ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
With a lot of difficult problems ______, the newly-elected president is having a hard time.
| A．settled | B．settling | C．to be settled | D．to settle |