Choose the correct words in the conditional sentences. 1. if scientists find/found a cure for aids, it would save lives around the world.
2. if diseases didn't/don't exist, more people would reach their 100th birthday.
3. if we use up all the world's oil, we need/ll need more renewable energy.
4. if oil prices continue to rise, petrol gets/will get more expensive too.
5. if scientists made human clones, I think the world will/would be a dangerous place