单项选择题

Researchers______ that genes may determine the strength of the immune system which could help explain how an infectious disease could have a hereditary link.

A．speculate
B．estimate
C．evaluate
D．anticipate
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单项选择题
Prior to our conference, the executive director had requested that everyone______ well prepared.
A．is
B．be
C．was
D．will be
单项选择题
That summer I drove west with a friend and we______ a little money doing odd jobs and as much as possible visited his relatives.
A．picked up
B．stepped up
C．put aside
D．set aside
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