单项选择题

Don't throw ______ the sponge yet! You may still have a chance to win!

A．by
B．in
C．on
D．for
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单项选择题
By the year 2010, scientists probably ______ an effective treatment for cancer.
A．will have discovered
B．are discovering
C．will be discovering
D．have discovered
单项选择题
Since the Second World War, most urban growth in the United States has occurred ______ of existing metropolitan areas.
A．on the outskirts
B．on the outskirt
C．on outskirts
D．on outskirt
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