－When did your father come back last night?－He didn’t come back_________ he finished all the work.
#57188
A
until
B
while
C
if
D
that
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At school, some students are active ______ some are shy, yet they can be good friends with one another.
#55459
A
while
B
although
C
so
D
as
Many people believe _______ robots will do most of our housework in the future.
#57999
A
that
B
if
C
why
D
how
None of them knew what happened __________we told them about it.
#57554
A
since
B
after
C
until
D
while