Read and Complete

Choose the word that best completes each blank.

Glass may look solid and permanent, but it is one of the easiest materials to recycle endlessly. Unlike paper, which weakens each time it is reused, glass can be melted down and reshaped again and again without losing quality. Recycling it also saves energy, because melting old glass takes less heat than making new glass from raw sand. For these reasons, a single bottle could, in theory, be reborn as a new bottle countless times.

Glass can be recycled —endlesslyoncerarely without losing quality, and melting old glass uses less —energymoneyspace than making new glass from raw —sandwoodmetal.