Look! The children ______ in the river.

A: Who's that ____( boy / girl) ?

B: He's my brother.

 A: Is the ____( man / woman) your mother?

B: Yes, she is.

A:____ (What's / Who's) that man?

B: Guess.

A: Is ____( he / she) your father?

B: No, he isn't.____ (She's / He's ) my teacher.