2. There is no need to rewrite the essay completely  it's quite good. You  only rewrite the third passage.

Solution:

• 2. There is no need to rewrite the essay completely, as it's quite good. You need only rewrite the third passage.

Reasoning:

• For the first blank, "as" (or "since" or "because") is used to provide a reason why rewriting is unnecessary.
• For the second blank, "need only" indicates that rewriting the third passage is the only action required, implying it's a limited necessity.

Answer: as, need only