-________students are there in your class? -There are 56.
#43368
A
How many
B
Who
C
What
D
When
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I think taking a walk is       boring.
#40090
A
a kind
B
kind of
C
kinds of
D
a kind of
 I had a hard time learning math last year. 
#39953
A
was hard-working
B
worked hard
C
had trouble
D
didn’t like