单项选择题

--How is John's fever--Nothing serious, ______ it gets worse, we'll send for a doctor.

A．After
B．Unless
C．Until
D．If
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单项选择题
According to the Guinness Book of World Records, the oldest man in the world now lives in Ecuador, ______ is 116 years old.
A．where
B．when
C．who
D．which
单项选择题
The manager has got a good business ______ so the company is doing well.
A．idea
B．sense
C．thought
D．thinking
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