1 . Please allow me to thank you for your offer of help ________（代表）my colleagues. （根据汉语提示完成句子）

2 . Between 1405 and 1433, ________ (代表) Ming Dynasty, Zheng He made a total of seven voyages. （根据汉语提示完成句子）

3 . _______ _______ _______ (代表) my family and my late grandma, I’d like to thank you for your support at this difficult time. (根据汉语提示完成句子)

4 . Los Angeles is the second largest U.S. city______ population, afer New York City.

A．in terms of

B．on behalf of

C．by means of

D．for lack of