1 . 用户名和密码不要经常改动，否则会引起不必要的麻烦。（otherwise)

2 . I have to talk to a coach _____________________（名叫）Tom Green. (根据汉语提示完成句子)

3 . The articles were published in San Francisco newspapers _________ _________ _________   _________ (以...名字) Dorothy Dodge. （根据汉语提示完成句子）

4 . —How do the shops make money if they sell at such low prices?
—Manufacturers, it seems, are willing to bring down prices _______ big volume purchases.

A．under the name of	B．on behalf of
C．in return for	D．in preparation for