—______will you come back, Mum? —In ten minutes.
The ________ you learn, the ________ you want to learn.
--- Look at these stamps. I _______ them for five years.--- Wow, they are beautiful.
My mom always thinks that my hobbies _________ of my study.
Our teacher says that the classroom must __________ every day.
--- Look at the boy running on the ground. Is it Frank?--- It ________ be him. I saw him go to the library just now.