The correct form of the verb in parentheses "come" is "will come".
Here's the explanation:
Since the sentence is "Sally hopes that a lot of people (come) to the party," and it expresses a hope about a future action, we use the simple future with "will" + base form of the verb.
Full sentence: Sally hopes that a lot of people will come to the party.
Answer: (come) → come (it's in the Command/Infinitive form because the base form is used after "hope that" to indicate a future event anticipated to happen).
However, in this specific case, the sentence is asking for the correct form in lowercase, so the final answer is:
will come