单项选择题

Don't let ______ that you know me. I want to keep it secret.

A．on
B．up
C．down
D．go
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单项选择题
No case is on record of a ______ being ceasing to be ______ under cultivation.
A．variable, variant
B．variant, variable
C．varied, various
D．variable, variable
单项选择题
We've, under extremely difficult conditions, done very well, ______.
A．to consider all things
B．considering all things
C．all things were considered
D．all things considered
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