---How long does it take us to go to Mount Qingcheng?---It takes us hour or more to go to Mount Qingcheng by subwayA.an;a B.a;an C.an;/
Dr. Ma used to two or three persons in the hospital.
The children without parents ______ good care of by their teachers in this special school.
Do you have________ to say about your study?
My uncle is used to for the children in poor areas.
Our teacher told us in the class.