Question

complete the sentence.

bicycle repair specialists claim that a well - oiled bicycle chain should function noiselessly, shift gears smoothly, and ________.

last longer

should last longer

Explanation:

To maintain parallel structure, the items in the list ("function noiselessly", "shift gears smoothly") are in the base form (without "should"). So the correct phrase should also be in the base form, matching "last longer" (not "should last longer").

Answer:

last longer