Happy birthday ___ you .A. for B. to C. at
I can’t play the piano,and________.
She’s not strong enough________walking up mountains.
—Could I borrow your camera? —________,but please give it back by Saturday.
—Sir,could you please put out your cigarette?This is a smoke-free(无烟的)school. —________.
Few people think about what they can do________others.