完形填空：
    67-71 ADABD
    72-76 CBABD
    77-81 AADCB
    82-86 ADBCA
    翻譯答案:
    87. that they have no solutions so far.
    88. what most parents are concerned about.
    89. in case it is getting colder
    90. decided to start their own business.
    91. until a doctor discovered it by accident.