--Peter, don’t play that kind of jokes any more?--Sorry, I ________ do it again.
—The song Where did the time go______the old days and the love of family.
On this day,Dr.Martin Luther King_______,but we didn't know who________him.
Mary likes helping others._______, she often helps the old cross the road after school every day.
I didn't understand_______. So I put up my hand to ask.
—Where were you doing when I called at your house this morning?—Oh,I______ for a friend from New York at the airport.