------ I wonder ______ you’ll water this kind of tree. ------- Once a week.
#35726
A
how often
B
how long
C
how soon
D
how much
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There         one country in the world.
#36000
A
will be only
B
be will only
C
will only be
D
only will be
Math is boring and       difficult.
#35947
A
of
B
too
C
any
D
some