Are there any other reagents except HNO3 and H2SO4 for Nitration?
It's getting on for 3 decades since since I've done organic, so a proper organic chemist can probably give a more complete answer, but yes, there are other ways to do this. In the $\ce{HNO3}$/$\ce{H2SO4}$ system the "real" nitrating agent is nitronium, $\ce{NO2+}$, so anything that can form that will nitrate benzene. One example is simply to use a nitronium salt such as nitronium tetrafluoroborate, $\ce{NO2+ BF4-}$. As for others I would be surprised to find that something like $\ce{NO2F}$/$\ce{BF3}$ doesn't work, but I don't know for certain - it's been a looooong time!