单项选择题

Gravity is sure to play an important part, （）the ball （）into the air won’t go up.

A．as, thrown
B．for, thrown
C．since, throwing
D．as, throwing

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单项选择题

Long before children are able to speak a language, （）communicate through facial expressions and by making noises.

A．however
B．they
C．furthermore
D．who

单项选择题

An investigation was made into the accident, （）five people were killed.

A．where
B．for that
C．when
D．in which

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