Do you know______man in white?－Oh, he is_________ scientist from America.

Not only ________ their own ideas on the matter,but ________ theirs .

Before I talked with ______ scientist, I had never met______ clever person like him.

Kim, I haven’t seen your mother for so long, where is she? —Oh, she ________________ England to learn further studies(深造). She left a month ago.

Is this red bag yours?—No, it isn’t. is that black one.