—I will buy you a new bike if you learn how to swim this summer.

—Is that a ________? I’m sure I’ll get the bike.

A．chance

B．promise

C．trick

D．treat

—What are you? 

—__________.[ ]

A. I'm very well.          

B. I'm eleven    

C. I'm in Mr. Li's office    

D. I'm a basketball player