单项选择题

Many people believe that our species ______ threatened with extinction.
IA] is [BI are [C] are to be [D]used to be

A．[BI are
B．IA] is
C．Many people believe that our species ______ threatened with extinction.
D．are to be
E．used to be
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Much ______ I love him, I can't forgive his action.
A．that
B．like
C．as
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John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.
A．while
B．when
C．until
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