Why _________Beijing Duck?—Good idea. Let’s go．

I found there was only one copy of “Bighead Son and Small-head Father” on the bookshelf, so I decided to buy _______ at once.

What do you usually get _____ your birthday? [ ]

Are these books ________? —No, they are not mine. They belong to ________.

He hardly ever exercises. So he is _____ unhealthy.[ ]