1．Attracting _____ senior citizens, Florida is _____ home to the largest population of elder Americans．
A．不填; 不填 B．the; the C．the; 不填 D．不填; a
2．—Do you think the weather will be all right this summer?
—No, _____ we are lucky．The newspaper says it'll be very hot anyway．
A．if B．though C．unless D．as
3．The first prize winner _______, John was so disappointed that he felt unwilling to know the rest of the results．
A．announcing B．announced
C．having announced D．had been announced
