The blue jacket (夹克) looks nice on you, _______ is it?—It’s 50 dollars.[ ]

It __________ great to watch Harry Potter on TV tonight.

It will not be　　　　　　we meet again.

Are these books ____.— No. they are not mine. They belong to ______.

Listen! Is Kate playing the piano in the room? —No. It _________ be her. She has gone to London with her parents.