问题描述：
A:Who's this girl?
B:(She's) my sister.
A:Why is she ( ) these clothes?
B:(Beause) she is a ballerina(芭蕾舞女演员).
She's dancing.
A:Wow!She's beautiful!
(How) (old) is she?
B:She's only 17 years old.She's very talented(有天赋的).
帮我在（）里填上适当的词
B:(She's) my sister.
A:Why is she ( ) these clothes?
B:(Beause) she is a ballerina(芭蕾舞女演员).
She's dancing.
A:Wow!She's beautiful!
(How) (old) is she?
B:She's only 17 years old.She's very talented(有天赋的).
帮我在（）里填上适当的词
问题解答：
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