Hard working though he was, ________ there was never enough money to pay he bills.
A. /
B. and
C. but
D. Therefore
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________ water is to fish, so air is to man.
As if
B. if
C. As
D. Although
Much hard ________ he tried, he failed to catch up with the first runner.
A. although
B. as
C. while
D. When
________ , I have to put it away and focus(集中)my attention on study this week.
A. However the story is amusing
B. No matter amusing the story is
C. However amusing the story is
D. No matter how the story is amusing
________ we are allowed ________ , we can’t drink any beer.
As long as; to do
B. If; to
C. Unless; to
D. On condition that; doing so
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