单项选择题

John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.

A．while
B．when
C．until
D．unless
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单项选择题
Electrical appliance such as toasters or hair dryers are designed to ______ the ability of an electric current to heat a wire.
A．take the risk of
B．take advantage of
C．take responsibility
D．make sense of
单项选择题
Mother always puts the knife beyond the reach of the kids lest they ______ it.
A．had taken
B．took
C．would take
D．should take
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