－What do you think of the four classics (名著)of China?－I hear that they are wonderful, but I’ve read _______ of them.

 —Is that your model plane? — No, it's his,            is on the sofa.

—Is the girl in the red skirt your sister?—No. She is____ classmate.

—Would you like milk or juice?— _________ is OK. I don’t mind.

I have two story-books. One is for you and ______ is for your sister.