Mr. Chen teaches __________math. We all like _________ very much.

How is your recent trip to Sichuan—I’ve never had ______ one before.

________he can’t understand is ________his son doesn’t like the school. He is very upset about this.[ ]

It will not be he returns from abroad

Has your father returned from Africa yet? —Yes, but he ____ here for only three days before his company sent him to Australia