____ I walked for six hours, I was tired out.
After
Before
C. When
D. As
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The car is quite old ____ in excellent condition.
A. and
B. but
C. or
D. either
We will make fewer mistakes ____ we are careful enough.
A. as long as
B. so that
C. as far as
D. even if
The box is ____ heavy ____ I can’t lift it.
A. such, that
B. too, to
C. very, that
D. so, that
It’s our duty ____ the room everyday.
A. to clean
B. cleaned
C. clean
D. cleans
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