You will never gain success ______you are full devoted to your work.
A. when
B. because
C. after
D. unless
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Lessons can be leaned to face the future ______history cannot be changed.
A. though
B. as
C. since
D. unless
I don't believe we've met before. ______I must say you do look familiar.
A. therefore
B. although
C. since
D. unless
l’ll be out for some time. ______anything important happens, call me up immediately.
A. In case
B. As if
C. Even though
D. Now that
______you start eating in healthy way,weight control will become much easier..
A. Unless
B. Although
C. Before
D. Once