What great trouble we had _______ where his house was.
The patients believe that the doctor knows exactly how to put them _____.
Comrade Li Dazhao, _____ librarian of Beijing University, was one of the founders of the Chinese Communist Party.
The open university was started in order to help those who _____ having a university education when they were young.
He has left his book here on _____, so that you can read it.
I remember her face but I cannot _____ where I met her.