单项选择题

Every home entertainment system from Bryan's Electric comes with a two-year warranty and free ______ .

A．interaction
B．installation
C．decline
D．proposal
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So as to ensure customer ______ , Easy Buy offers its members major discounts on bulk purchases.
A．loyalty
B．honesty
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Although the swimmer failed to make the final, she did ______ her personal best during the race.
A．achieve
B．incur
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