31. We are waiting ______ for your absence.
| A．your explanation | B．to have your explanation |
| C．about your explanation | D．having your explanation |
-Mary, would you like to come to my birthday party?
-_____.
| A．Of course, you could | B．Sure. Go ahead |
| C．Sorry, you may not | D．No, you mustn’t |
-When ____ you return the dictionary to me?-Only when I ____ you next Sunday.
| A．will；see | B．do；will see | C．will；will see | D．do；see |
Charles did what he could _____ the servant, although he himself was in danger.
| A．rescue | B．rescued | C．to rescue | D．rescuing |
Let us hope we can settle the matter without _____ more trouble.
| A．any | B．a little | C．some | D．little |
-What do you think of the book?
-Oh, excellent. It is worth _____ second time.
| A．to read a | B．to read the | C．reading a | D．being read the |