The painting you drew is beautiful. But why not paint the walls ________ .
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.
David is always so busy____he has little time for his family.
—Can you repeat what I said just now?—Sorry,I didn't hear it.I________out of the window.