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They didn’t go to bed ________ they finished their homework.
#55880
A
when
B
because
C
until
D
if
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______ she stood up, she dropped the necklace.
#56104
A
As
B
While
C
Before
D
Until
 Ed Smiths loves tennis, ________ he doesn’t play it. It’s difficult for him.
#56975
A
because
B
but
C
and
D
for
David didn’t give up ______ he had failed in the experiment four times．
#57729
A
if
B
while
C
though
D
since
___________ the car’s old, it still runs well.
#55333
A
Because　　　
B
So　　
C
Although
D
But
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