That, is the answer i would think
Answer: Cassius actually believes that the Romans are strong.
Cassius actually believes that Caesar wants to be a tyrant.
Cassius actually believes that Caesar does not want to be a tyrant.
Cassius actually believes that Caesar is a victim.
Explanation:
You should use a correlative conjunction here.
Both . . . and
Either . . . or
Neither . . . nor
Not only . . . but also