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
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单项选择题
Variables such as individual and corporate behavior ______ nearly impossible for economists to forecast economic trends with precision.
A．make
B．make it
C．making
D．makes it
单项选择题
We ______ but we forgot his telephone number.
A．might have called him
B．would call him
C．called him ______
D．should call him
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