I assume you are asking for the correct choice between "it" and "them" for each of the sentences provided. Here is the correct answer for each sentence:
1. We don't eat cherries because we don't like "them".
2. Massimo lost his book. Have you seen "it"?
3. Be sure to wash the apples before you eat "them".
4. The mother took her children to the park. She watched "them" play for an hour.
5. Regina watches the program every week. She never misses "it".
In these sentences, "it" is used when referring to a singular object, and "them" is used when referring to multiple objects.