Bill won’t make any progress_____he studies harder than before.
#58418
A
if
B
when
C
because
D
unless
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Tom didn’t give up studying ________________ he failed many times.
#57075
A
but
B
even though
C
because
D
if
—I have no idea ____________ tell her the bad news. —I think tomorrow is the best time.
#55971
A
how to
B
when to
C
how
D
when
Some people won’t realize the importance of their health _____they have lost it.
#56772
A
after
B
when
C
until
D
as