Witch part of a dictionary entry can most you use a work correctly in a sentence

I think that it would be the synonyms. Because you can replace it with other words to see if it makes sense.

Explanation:

he believed if we do not fight back the britins would be in every household

the apollo program, also known as project apollo, was the third united states human spaceflight program carried out by the national aeronautics and space administration (nasa), which succeeded in landing the first humans on the moon from 1969 to 1972.