She asked ________.
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.
—— Do you go there ___bus? —— No, we go there ___a train.