Tom was walking along the riverside when he heard someone calling him from behind. He turned around_______ found nothing.
#56161
A
but
B
and
C
so
D
or
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There’re many trees on ________sides of the river.
#57991
A
both
B
all   
C
each  
D
every
_____ he was tired , ____ he didn’t stop working .
#57240
A
Although ; but
B
Though; /
C
But ; /
D
Though ; but