单项选择题

_______you_______further problems with your printer, contact your dealer for advice.

A．If, had
B．Have, had
C．Should, have
D．In case, had
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单项选择题
Since it is too late to change my mind now, I am______ to carrying out the plan.
A．obliged
B．committed
C．engaged
D．resolved
单项选择题
The higher the standard of living and the greater the national wealth, ______
A．the greater amount of paper is used
B．the greater is the amount of paper is used
C．the greater the amount of paper used
D．the amount of paper is used is greater
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