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Father’s Day is on _________ Sunday of June.

           A. three           B. the three           C. third       D. the third

The third question is ______ of the three.

[    ]

　　A. most difficult (難的)   B. more difficult

　　C. the most difficult　　  D. much more difficult

________ the students in this school is about three thousand，and ________ of them are girls．

A．A number of；two third                     B．The number of；two thirds

C．A number of；two thirds                     D．The number of；two third