重点 :  (1)recognize, surely, explain,
             jewellery, continue, lovely, 
             debt, precious, attend, earn,       
             silly, besides, quality
          (2) call on,           bring back,       
           day and night,     pay off,           at most, 
            act out,        come up with,     be worth, 
             take up,             no more/longer, 
           so/such…that,             a bit/ little
         (3) 表推测的情态动词can, could, may, might, must