Although they feel tired, _________they still go on working. 
#56265
A
so,
B
but
C
/
D
and
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You should keep working hard __you have passed the exam.
#57092
A
if
B
because
C
even though
D
when
There’re many trees on ________sides of the river.
#57991
A
both
B
all   
C
each  
D
every
______I know him, ______I hardly talk to him.
#58081
A
Although; but
B
Although; /
C
/; Although
D
But; although