单项选择题

When will the world's population hit 10 billion

A．2010.
B．2002.
C．2036.
D．2054.
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In the Unites States, it is required that all children______ school, public or private, for 12 years
A．must attend
B．need attend
C．should attend
D．ought to attend
单项选择题
Slowly, without trying to defend himself, the buffalo sank to his knees and, with one lion______ his throat and another his muzzle, died of suffocation.
A．hold
B．held
C．holding
D．being held
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