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In Sydney, there’s only ________ average of 23 days a year when ________ sun doesn’t shine.
#9526
A
the, the
B
an, /
C
an, the
D
the, /
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It was________great shock to the world that two aero-planes crashed into ______World Trade Center in New York o September 11th, 2001.
#10415
A
a; /
B
a; the
C
the; the
D
/; the
I want to catch _____ early train, but couldn’t get _____ ride to the station. 
#9116
A
an; the
B
\; the
C
an; \
D
the; a
Some researchers are finding that daydreaming may be important to ______ mental health. Daydreaming, they say, is ______ good means of relaxation.
#8871
A
the; 不填
B
不填 ; the
C
不填; a
D
不填; 不填
---How about ______lecture you attended last night?---It was too boring , indeed ,____lecture for me.
#8677
A
the ; /
B
/ ; the
C
a; / the
D
the ; a
-- Have you seen ______pen? I left it here this  morning-- Is it ______black one? I think I saw it somewhere
#8449
A
a;the
B
the;the
C
a;a
D
the;a
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