Mr. Li, I can’t understand everything in class.—Don’t worry! I’ll ________ the main points at the end.

turned to the person ________ next to me, Irecognized that he was my schoolmate

Are you sure Mike will help us if we are in trouble— _____. He is a reliable friend.

Will you be ____ this afternoon , John?—-It depends. I’ m afraid I’ll be called in by my boss.

When the doctor told me that my grandfather is badly ill, I am really him.