Question

complete the sentence.
either rebecca will take the time to get a scuba diving certification or
her familys planned dive.
will miss
she will miss

Explanation:

The sentence structure "Either...or..." requires parallelism. The first part "Rebecca will take..." has a subject (Rebecca) and a verb phrase. The second part should also have a subject and a verb phrase for parallel structure. "she will miss" includes the subject "she" (referring to Rebecca) and the verb phrase "will miss", maintaining parallelism. "will miss" lacks a subject, making the structure unparallel.

Answer:

she will miss