I don’t know if he _______.If he ________ .I will tell you at once.

________name is Bill, and ________ name is Jack.

On catching sight of his mother, the little boy _________ his grandmother and threw himself into his mother’s arms.

What he enjoys _________ great and interesting.— Yes， but it’s dangerous.

Can you tell me how many study groups there are in a class?— Generally speaking, a class often ___ 8 study groups, each with 7 group members.