1. If the global population (continue) to grow, one day there (be) serious environmental problems., continues / will be, continue / is, continued / would be, will continue / are, 2. We (not/need) to worry about global population growth if we (have) more environmental resources., won't need / have, wouldn't need / had, wouldn't need / have, don't need / had, 3. Unless we (control) the growth in global population, pollution and traffic congestion (worsen)., will control / worsen, control / would worsen, control / will worsen, controlled / would worsen, 4. If we (run out) of oil in the future, we (have to) rely on other sources of energy., ran out / would have to, will run out / have to, run out / would have to, run out / will have to, 5. If it (rain) more in some countries in the developing world, there (be) fewer droughts., rained / would be, rains / will be, rain / are, would rain / were, 6. What (we/do) when we finally (use up) all of the Earth’s resources?, do we do / used up, are we doing / will use up, would we do / use up, will we do / use up, 7. If more women (hold) positions of power, there (be) fewer wars., hold / will be, held / would be, would hold / were, held / will be, 8. As soon as the global economy (recover), people (start) to spend more money again., recover / start, will recover / start, recovers / will start, recovered / would start, 9. If advances in medicine and science (continue), people (live) longer., continue / will live, continue / would live, continued / would live, will continue / live, 10. Life (be) much more difficult if we (not/have) electricity., is / won't have, would be / don't have, will be / don't have, would be / didn't have, 11. If people (not/drive) their cars so much, cities (be) less polluted., wouldn't drive / were, didn't drive / would be, don't drive / will be, didn't drive / will be, 12. Farmers in developing countries (earn) a decent living if they (receive) a fair price for their produce., earn / will receive, would earn / receive, would earn / received, will earn / receive

Conditionals: First or Second Conditional

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