-- Look at the boy running on the ground. Is it David?-- It _______ be him. I saw him go to the teacher’s office just now.
He is taller than ______ in his class.
We will spend ______ doing our favorite things.
Are you feeling ______ to go to school?
You can get a good result ______ you work hard.
The old man felt ______, for he lived ______ in a ______ house in the mountain.