15. With the reform of educational system, the teachers_____school I worked before have greatly changed their way of teaching.
He is running____the wind towards the station_____ Tom running ________the right.
I don’t think you can work out the maths problem____her help.
My uncle lives____116 Changhe Street. His room is ____the sixth floor.
The old man died______ cold _______ a cold night.
The trees ___front of the house are ___the charge of Mr. Li.