选出恰当的单词。A: Who's that {#blank#}1{#/blank#}( boy / girl) ?
B: He's my brother.
A: Is the {#blank#}2{#/blank#}( man / woman) your mother?
B: Yes, she is.
A:{#blank#}3{#/blank#} (What's / Who's) that man?
B: Guess.
A: Is {#blank#}4{#/blank#}( he / she) your father?
B: No, he isn't.{#blank#}5{#/blank#} (She's / He's ) my teacher.