—Look! The boy in the white shirt ___be Tom. --It ____be him. I saw him enter the library just now.
It was _________ difficult work _________ nobody can do it.
---Have you cooked supper_________? ---Yes, I have _________ finished it.
---What’s wrong with my son, doctor? --- _______ serious. Just a slight cold.
It’s more than 8 years since I a teacher.
Learning English will us a lot of time.