Bill won’t make any progress __ he studies harder than before.
#58046
A
if
B
when
C
because
D
unless
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— When shall we leave for China? — We won’t we have visited all the places of interest here.
#57775
A
until
B
while
C
as
D
since
The policeman is still not sure ______ the young man killed himself or was killed.
#56983
A
if
B
that
C
whether
D
weather
My sister is only five, but she always tells me ____ my pictures are good or not.
#58117
A
if
B
whether
C
that
D
how