单项选择题

Millions of Americans flock to their drugstores to buy vitamins and minerals, ______ that these pills can help to prevent serious illnesses.

A．convincing
B．convinced
C．to convince
D．to be convinced
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单项选择题
Everything we eat and drink contains some salt; we can meet the body''s need for it from natural sources without turning ______the salt bottle.
A．up
B．to
C．on
D．over
单项选择题
We had to _____a lot of noise when the children were at home.
A．go in for
B．hold on to
C．put up with
D．keep pace with
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