In face of      failure, it is the most important to keep up         good state of mind.
#8843
A
不填, a
B
a, 不填
C
the, a
D
不填, the
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 As _______rule, apples are sold by _____weight and eggs by ________dozen.
#10074
A
a; 不填;the
B
a; the; the
C
a; a; the
D
the; 不填;不填