Answer:
However
Explanation:
However is used because this portion of the sentence is referring to a completely new and unrelated subject.
We are talking about Cassius speaking to Brutus and the main emotions that they reflect are a mix of anxiety and urgency about the scheme they are planning. When they say they fear they might be discovered when they say to each other: "I fear our purpose is discoverèd" or "<span>be sudden, for we fear prevention</span><span>" </span>
Answer: All respect him. or Everyone respects him