It snowed heavily for three days and they were separated from the outside world.
| A．in the end | B．on end | C．by the end | D．at the end |
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 |
-----Has any of you reached the Great Wall ?
-----__________.
| A．None | B．No | C．No one | D．Not any |