Teacher's Day is --- the -------of the September.请补充完整

Teacher's Day is --- the -------of the September.请补充完整
Teacher's Day is --- the -------of the September.
请补充完整

Teacher's Day is --- the -------of the September.请补充完整
Teacher's Day is on the tenth day of September.
教师节是在9月10日；day前面的介词要用on.
另外,你的题打错了,月份被泛指时,前面不能加定冠词,所以把the去掉.

Teacher's Day is on the 10 of the September

Teachers\'Day is on the 10th of the September.

Teacher's Day is in the 10 of the September