— times did you do exercise last week? — Twice.
#56327
A
How often
B
How much
C
How many
D
How long
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—All the isatis root（板蓝根） is sold out!—People are crazy! experts say there is no use eating isatis root to preventH7N9, some people still don’t believe it.
#56593
A
Although
B
Unless
C
As a result
D
In order that
--- What is our head teacher like, do you know? --Oh, he is very kind, ________ he looks very serious.
#55617
A
because
B
though
C
if
D
when
____________ our football team failed in the match, we did our best.
#58436
A
Though
B
But
C
Because
D
As