I’m afraid I can only make a small contribution this time.—____.We really appreciate your assistance.
Must I hand in my exercise book now, Mr. Zhao?—No, you ______. You may give it to me tomorrow.
Linda’s mother used to be ________ university teacher. She taught maths.
Is __ your brother?
Ben looks strong. Has he ever been sick?— He’s a superman! He ________ goes to the doctor.