—Is this your baseball?—No, it’s Bob’s. Baseball is _________ favorite.

     sister is twelve,and        is a student.

I have two tickets for the film. One is mine and _____ is yours.

This is ______ pencil box.

--Do you know the cost of buying a house in Shanghai is much higher than __ in Tibet? ---Of course, I know. It’s impossible for me to buy_____ there.