We will make fewer mistakes ____ we are careful enough.
A. as long as
B. so that
C. as far as
D. even if
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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
Let him _______ a rest. I think he must be tired after the long walk.
A. has
B. have
C. to have
D. having
It was at 8 _____ I went to bed yesterday.
A. that
B. who
C. when
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