THE ENVIRONMENT People didn't use to worry about the environment much when I was a child. There were not (recycle) bins in my town, so we would put all our litter in one bag and throw it away. The government kept focusing on economic 2 (grow) so that everyone had a well-paid job, a three-bedroom house and a powerful car. 3 (forest) was just a difficult word to pronounce and we were not aware of the consequences of cutting down the rainforests. We didn't oppose the (destroy) of wildlife habitats as it was part of progress. It took us many years to realise that we won't be able to survive as a species without having clean (renew) energy sources, like solar power, or withour stopping global warming. I hope it is not too late for our planet to make a full 6 after all the damage we have done to it. (recover)

4. Because he had not checked the oil for so long, the car broke down. 5. She couldn’t find the book that I had lent her. 6. All the people that we had invited turned up, and some that we had not invited. 7. They never found where he had hidden the money. 8. It was a firm that I had never heard of. 9. When she came in, we all knew where she had been. 10. The lesson already had started when I arrived. 11. I met Paul yesterdaybut I did not recognize him at first. He has changed so much! 12. We came out of the shop and went to the car park. But our car was no longer where we had left it. 13. He was afraid of the first driving lesson because he had never driven a car before. 14. I went to a firework display last week and I enjoyed it very, very much. I had seen fireworks before but this display was absolutely the best. 15. Mike did not want to go to the cinema with us. He said he had seen that film several times already 

1 if she worked hard, she would know English well.
If she had worked hard, she would have known English well.
2 If they were hungry, they would have their lunch.
If they had been hungry, they would have had their lunch.
3 if he drove slowly, he wouldn't be in time for classes.
If he had driven slowly, he wouldn't have been in time for classes.
4 if he lived in Moscow, he would go to Moscow University.
If he had lived in Moscow, he wouldn't have gone to Moscow University.
5 if you listened toyour teacher carefully, you would learn a lot.
If you had listened to your teacher carefully, you would have learnt a lot.
6 if it rained , we wouldn't go to the country.
If it had rained, we wouldn't have gone to the country.
7 if he were wrong, the teacher would correct his mistakes.
If he had been wrong, the teacher would have corrected his mistakes.
8 his dad would give him money if he asked for it.
His dad would have given him money if he had asked for it.
9 I would help you if you had any problems.
I would have helped you had had any problems.
10 if it snowed we would go skiing.
If it had snowed we would have gone skiing.