Helen has just heard the news from her father ________ her boyfriend David will come back soon.
#30074
A
when
B
how
C
which
D
that
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We should consider the students’ request________ the school library should provide more books on popular science.
#31694
A
that
B
when
C
which
D
where
—People often don't appreciate what they have, do they? —No, _________ they lose it.
#30726
A
if
B
after
C
until
D
when
.Few people paid full attention to their health conditions _____ they were seriously ill.
#32922
A
when
B
if
C
until
D
before