Jane, I can’t find Lucy in the classroom. —Oh, she ________ the piano in the music room.

Whose volleyball is this?–It _______ belong to Carol. She loves volleyball.

Is air the lightest thing in the world?– Not . Scientists from Zhejiang University have just developed the world’s lightest material.

My cousin is _____________ sometimes. It’s hard for him to change his mind even though his idea is not right.

You should _____ some English every day. It’s good for your vocabulary.