— Someone is knocking at the door. Is it Ann?— It _____ be her. She is giving a performance at the theatre now.
He _____ to sleep already. I _____ him about it tomorrow.
Sam is my friend, he is a _____ boy now.
Daming hasn’t learnt singing _____ dancing.
---Where’s your father? ---He _____ to work.
---Have you finished your work _____? ---Yes, I have. I’ve always finished it.