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This chair is        black and that is        orange chair.
#32557
A
a; /
B
/; a
C
a; a
D
/ ; an
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Everyone knows that _____ sun is in the center of the solar system（太阳系）
#33645
A
a
B
an
C
the
D
/
It’s _______  MP5 . It can be used to listen music and watch movies . It’s ________ useful invention .
#32500
A
a ; a
B
a ; an
C
an ; a
D
an ; an
 Max is _______honest boy.  He has _______ useful book.
#33011
A
an; an
B
a; a
C
a; an
D
an; a
 I can play ______ guitar, and I usually play it on ______ weekends.
#32179
A
a; the
B
a; /
C
the; /
D
/; the
-What's that?      -It's     _apple.
#32795
A
a
B
an
C
the
D
/