There is somebody knocking at the door. Who________ it be?—I’m not sure. It ________ be a postman.

When will you have your MP4 repaired?–Pardon?–I asked you ___________.

Violence (暴力) in films has a bad effect ____ people.[ ]

Have you brought with you? We won’t have time to come back.—Don’t worry. All the things we need are here, in this big bag.

I don’t know the meaning of this word; can you ______ it in Chinese?