---Why are you so happy?--- ______ the teacher’s help, I found the answer ______ the question.
The famous doctor is going to operate ________ this injured boy.
________ class went to the Great Wall during the holiday.
Anny wants a room ________ his own. A.of C.on C.for D.to
He expects ________ to Tibet for traveling.
Jim is so clever that he can do everything ________.