—______ does your mother go for a walk? —Every afternoon.
#56080
A
How long
B
How often
C
How much
D
How many
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—What do I have to do ______ I want to be thinner?—Eat less, exercise more.
#57591
A
but
B
since
C
because
D
if
David doesn’t give up _______ he has failed in the experiment four times.
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if
B
while
C
though
D
since
__ we are young, we can still do something to help protect the environment.
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Because
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