He loved his dog _____ it were his own child.
A. as
B. if
C. because
D. as though
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He promises to help us _____ we can raise enough money for the project.
A. as soon as
B. when
C. unless
D. on condition that
It won’t be long _____ our society can completely solve the problem of heavy pollution.
A. before
B. since
C. when
D. after
Keep quiet _____ you have finished your assignment.
A. as
B. while
C. when
D. after
_____ you know the answer, you’ll find it fairly easy.
A. Unless
B. While
C. Once
D. Though
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