16. Mary answered all the questions _____ the last one, which she had never heard of before.
—You were brave enough to shout at the meeting.—Well, now I regret _____ that.
The general has been invested _____ full power.
The police have asked for witnesses of the accident to _____ to offer some help.
Her suggestion _____ to see Shanghai World Exposition interested every one of us.
Father made a promise _____ he would buy me a new dictionary if I passed the examination.