--David, are you 1istening to me?---Sorry, Dad. I _______ to make sense of what the reporter said.
David threatened ________ his neighbour to the police if the damages were not paid.
—Robert is indeed a wise man.—Oh, yes. How I regretted ________ his advice.
After Queen Elizabeth officially opened the 2012 Summer Olympics, London became the first city ________ three Olympic Games in history.
TV programmes, ________ to combine learning with fun together, are growing in popularity all over the world.
Without thinking, he ran out, ________ at a stranger to call the fire police.