Use of English · Parte 2
Recycling involves taking used materials and turning them (0) INTO new products. It is not a new concept: people (1) .......... been recycling for hundreds of years but (2) .......... rising energy costs since the 1970s it has become more of a necessity and is now common practice. The idea of recycling is to prevent…
Desbloquea todos los exámenes, simulaciones ilimitadas, las 80 fases del juego y mucho más.