8.Customers are asked to make sure that they ____ the right change before leaving the shop.  
#105342
A
will give
B
have been given
C
have given
D
will be given
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Although the causes of cancer ____we do not yet have any practical way to prevent it.
#105341
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered
8.Customers are asked to make sure that they ____ the right change before leaving the shop.  
#105342
A
will give
B
have been given
C
have given
D
will be given
—What's that noise?—Oh,I forgot to tell you.The new machine ________.
#105313
A
was tested
B
will be tested
C
is being tested
D
has been tested