单项选择题

You should know better than ______ your little sister at home by herself.

A．to leave
B．leaving
C．to have left
D．left
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单项选择题
It's hard to confirm or refute that there's a causal relationship between the amount of fat we eat and the ______ of heart attacks.
A．incidence
B．impetus
C．momentum
D．emergence
单项选择题
Great as Russell was, many of his ideas ______ today and are being modified by the work of philosophers of our time.
A．are to challenge
B．may be challenged
C．have been challenged
D．are challenging
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