SOS MNG ƠI 1. My father _______________________(spend) his childhood in the countryside and since he went to university he _______________________(live) in this town. 2. Millions of tons of oil and coal _______________________(burn) for energy every year. 3. Over the last two hundred years, more species _______________________(become) extinct than ever before. 4. If we recycle more, we _______________________(save) more natural resources for our children. 5. If we didn’t pour untreated waste water into rivers, many aquatic species ____________________ (not threaten).