(3) _______, most modern favelas appeared in the 1970s due to rural exodus, when many people left rural areas of Brazil and moved to cities.

Another way is to go by bike or walk instead of (5)________cars or motorbikes.

We can save fossil fuels (4)________conserving energy.

They are not (3)________like solar power, wind power, hydro power or biomass.

Fossil fuels (2)________millions of years to make.

All three were formed many hundreds of millions of years ago before the time of the dinosaurs – (1)________, we call them fossil fuels.

This is a (5) …………. festival and it attracts many visitors from all over the world each year.

(4) …………. the day, street performers delight people. At night, the city comes alive with comedy actors throughout the city.