Our school will organize ___ summer camp.
#36434
A
a eight-day
B
a eight-days
C
an eight-day
D
an eight-days’
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 She often goes to work __________     .
#41405
A
by a underground
B
by underground
C
by the underground
D
take the underground
 I had a hard time learning math last year. 
#39953
A
was hard-working
B
worked hard
C
had trouble
D
didn’t like