The medicine has a strong side ________ on our health though it works well.
I don't think you can work out the maths problem ____ the teacher's help.
My uncle lives ____ 105 Huanghe Street. His room is ____ the fifth floor.
My father was disappointed ____ the news.
His teacher was angry ____ him ____ his being late.
She felt disappointed when she found out they had gone swimming____ her.