单项选择题

Returning from school, ______ ．

A．he found a letter in the letter-box
B．a letter was found in the letter-box
C．a letter was in the letter-box
D．the letter-box had a letter in it
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单项选择题
Up to now scientists have not found how to ______ patients of that disease.
A．cure
B．treat
C．deal with
D．get rid of
单项选择题
Such electron tubes ______ in a radio set are also found in a TV set.
A．that we use
B．as we use
C．as we use them
D．that we use them
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