Tom: This is my schoolmate, Mary, and this is my girl friend, Susan. Susan: How do you dol.
Mary:（）

单项选择题Speaker A: I'm really grateful(感谢的) to you.Speaker B:（）

A. Not at all.
B. Think nothing of it.
C. Sure thing.
D. It' s been a pleasur

单项选择题Phone caller: Hello. Could I speak to HelenHelen:（）

A. Speaking.
B. I am Helen.
C. It' s me.
D. This is m