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Question 1:
At the presentation, you will learn about battery maintenance to __________ battery life and methods to restore weak batteries with an analyzer.
A. persist
B. endure
C. enlarge
D. prolong
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persist: to continue to exist past the usual time, or to continue to do something in a determined way even when facing difficulties or opposition

endure: to suffer something difficult, unpleasant, or painful

enlarge: to become bigger or to make something bigger

prolong: to make something last a longer time

=> "prolong" has the most appropriate meaning 

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