单项选择题

It has been rather costly to install the machinery, but it will prove to be worth the money ______

A．in conclusion
B．in the long run
C．in case
D．at the end
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The car is quite ______ of petrol.
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B．economical
C．saving
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What a lovely party! It's worth ______ all my life.
A．remembering
B．to remember
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