--Everyone can make a mistake.--Yes, but we should correct it it gets worse.
. ---You were brave enough to raise objections at the meeting. ---Well, now I regret ___________ that.
. Would you ___________ me your identification card, sir?
. He suggested ___________ on Saturday.
. It is no good ___________ to come now. He is busy.
. Although punctual himself, the professor was quite used ___________ late for his lecture.