--I think your father is very busy.--So he is._______ he still takes a walk with us sometimes.
#57621
A
So
B
And
C
Or
D
But
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_________you don’t give up(放弃)，your dreams will come true.
#56200
A
As long as
B
As soon as
C
As well as
D
As often as
The rivers will become dirtier and dirtier _______ we take action to protect them.
#55533
A
since
B
if
C
until
D
Unless