The cost of living in Chengdu is among the lowest in China, ________ the quality of life is probably one of the highest. 
#56003
A
since
B
when
C
as
D
while
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       he is very poor,       he feels very happy.
#55438
A
Although; but
B
Although; /
C
Because; so
D
Because; /
My father feels ________ because he heard from ________ today. 
#58571
A
happy;an old friend of he
B
happy;an old friend of his
C
happily;one of his old friends
D
happily;an old friend of him