The following sentences form a paragraph. Select the correct word or phrase for each blank to ensure consistent person and parallelism.
-The laser sets off commands for the computer to follow. Users need only keep their head still and __________.
A) controlling one eye is also necessary
B) control one eye

Question

Quizplus · Accepted Answer

The sentence structure is parallel in the beginning, "users need only keep their head still and _________." This means that the missing phrase should also be in parallel structure. Therefore, we need a verb to follow "and." "Control" is the correct verb form and matches the tense of "keep." "Controlling" would shift the verb tense and disrupt the parallel structure.

The Following Sentences Form a Paragraph