With temperature ______ so rapidly, we could not go with the experiment.
—The light in the office is still on. —Oh,I forgot ________.
—You were brave enough to raise objection at the meeting. —Well, now I regret ________ that.
-----Has any of you reached the Great Wall ? -----__________.
It’s the fifth time ______ late this term.
We found Mary’s brother to have _____ more story books than Ann’s.