The more you smile, the ___________ you will feel.

Thanks ____ your last letter.[ ]

Imy homework, I guess I can’t join you.

Whose names are these, ________ or yours? —_______. I don’t know all of the students in Class 5, so I have _______on this piece of paper.

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