can anyone give me an idea about what i can doing in the holiday?traveling to Brazil or Paris or London?

any place is charming

you can to paris where there is the fashion

Well I would point out that in Paris you can find wonderful brazilian restaurants like Gabriela or "La Taverne du Brésil et du Cap Vert" to eat feijoada or "pãos de queijo" and great english pubs like "The Frog" or "The Bombardier" with happy hours from 5 to 9 pm.

When one comes to Paris, one's should realize that the world lives in Paris.

But you wont have the brasilian sun and beaches of Rio de Janeiro in Paris. You wont have the trees of Amazonia in Paris (depending where you go in Brasil, it is so huge).
You wont have the fish n' chips of London in Paris nor the guards of the Queen and the Tower.

paris better I think

It is depend which holidays. If you go now in Paris it is raining and cold, so you should go in Brazil. But if you plan to take holidays this summer, go to Paris, than London because it is also a very nice city and close to Paris by train.