He _____ of _____ he had said at the meeting.
We human beings should be very careful with what we do with nature, _____power is beyond our understanding.
Scientists are convinced ______ the positive effect of laughter ______ physical and mental health.
Everybody in the village likes Jack because he is good at ______ and telling jokes.
Kidswillbe______abouteverythingwhentheyreacha certainage.
Mary said she was by no means angry; ______, she was glad to be able to make herself clearly understood.