_______ hard he tries, he never seems able to pass theexamination.
A. However as
B. No matter how
C. Although how
D. While how
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They will let you use their old house _______ you keep it clean.
A. in order that
B. so that
C. on condition that
D. until
______ the children have gone abroad to study we’ve got a lotof spare time.
A. Supposing that
B. Now that
C. Seeing that
D. In order that
He will choose to send his daughter to this kindergarten ____she doesn’t have to get up so early.
A. lest
B. as long as
C. in case
D. while
It may be three or five years _______ it is possible to test thismedicine on human patients according to scientists.
A. since
B. before
C. after
D. when