--- I was late for school this morning.---_______ You started early, didn’t you?
The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.
This school has strict rules. Almost no one can ________ cheating in exams.
Though we have been staying up for days, there’s still _____ work remaining to be done.
It is strange that the small boy _________ work out such a difficult exercise, which is even hard to settle for adults.
His wife has left him, but he behaved _______ nothing had happened.