—Listen! Someone is singing in the next room. Who ____ it be? Is it Li Wei?—No, it ______ be her. She is at school now.
The game is _____ funny that many of them like it.
I'm very glad _____ you.
More and more people in the world enjoy _____ now.
当经介绍后认识某人,你应该说:
Is the cat ________ the door? No, it isn’t. It’s ________ the desk.