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---Would you like to go bike riding with us tomorrow?  ---Sure, ____ I am busy.
#57802
A
since
B
unless
C
when
D
until
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____ he was very tired, he didn't stop to have a rest.
#56214
A
But
B
As
C
Because
D
Although
______ time goes by, China is getting stronger and stronger.
#56015
A
Until
B
While
C
As
D
When
一Let’s start to make dinner!一Mom , it’s best to read the instructions         using the new microwave oven.
#55128
A
before
B
but
C
and
D
or
 —_____do you have for dinner?—A big hamburger.
#56235
A
Who
B
What
C
Where
D
When
–Do you offer any discount on the notebooks? –Sorry, sir. There isn’t a discount        you pay more than 100 yuan.
#55450
A
although
B
until
C
unless
D
as