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[?i]
boy
wn
bro
[ ?][?]
brother
Boy,boy, boy, boy,
B-O-Y,B-O-Y,B-O-Y.
Brother,brother, brother,brother.
B-R-O-T-H-E-R，B-R-O-T-H-E-R，B-R-O-T-H-E-R.
Who's this boy?
He's my brother.
Guess,what's in my hand？
[ ?: ]
girl
wn
bro
[i] [?]
sister
Girl, girl, girl,girl,
G-I-R-L,G-I-R-L,G-I-R-L.
Sister, sister, sister,sister.
S-I-S-T-E-R, S-I-S-T-E-R,
S-I-S-T-E-R.
Who's this girl?
She's my sister.
A. Whose
B. Who’s
（ ）-- _______ this boy?
-- He’s my brother.