单项选择题

A competitor may submit any number of entries, ______ each one is accompanied by a pack et top.

A．guaranteeing
B．allowing
C．insuring
D．providing
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单项选择题
Scientists employ many modern techniques to ______ the origin of the world.
A．watch
B．grasp
C．treat
D．probe
单项选择题
I'd like to ______ this old ear for a new model but I can't afford it.
A．interchange
B．exchange
C．replace
D．convert
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