单项选择题

It ______ a lot ______ we can develop something to substitute for petrol.

A．occurs; whether
B．matters; whether or not
C．happens; even if
D．minds; if or not
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单项选择题
If Tim keeps working like this, he'll ______ sooner or later.
A．break down
B．give
C．get down
D．hold on
单项选择题
If that idea was wrong, the project is bound to fail, ______ good all the other ideas might be.
A．whatever
B．though
C．what's more
D．however
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