—Can I help you?
—I’d like to buy a present for my father’s birthday, at a proper price,but of good use.
| A．that | B．one | C．it | D．which |
Go on ________ the other exercise after you have finished this one.
| A．to do | B．doing |
| C．with | D．to be doing |
She reached the top of the hill and stopped ________ on a big rock by the side of the path.
| A．to have rested | B．resting |
| C．to rest | D．rest |
In some parts of London, missing a bus means ________ for another hour.
| A．waiting | B．to wait |
| C．wait | D．to be waiting |
—The light in the office is still on.
—Oh，I forgot ________.
| A．turning it off | B．turn it off |
| C．to turn it off | D．having turned it off |
—You were brave enough to raise objection at the meeting.
—Well, now I regret ________ that.
| A．to do | B．to be doing |
| C．to have done | D．having done |