Completar frases Complete the spacesVersión en línea Completar espacios en blanco por marisa degenova 1 and of with to rain 1 - Burning of fuels . 2 - Production chemichals . 3 - Reactin of polluting gases water in clouds . 4 - Formation of sulphuric nitric acids . 5 - The falls as acid rain . 6 - Damage the environment .