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8. on
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7. in/at
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7 . My first class .....in......... school begins .......at...... 7 : 30 o'clock .
8. We have an appointment to see ac doctor ....on..... tuesday . 
9 .My mother will give me a special gift .....at........... my birthday . 
 7 . My first class .....in......... school begins .......at...... 7 : 30 o'clock .
8. We have an appointment to see ac doctor ....on..... tuesday . 
9 .My mother will give me a special gift .....at........... my birthday .