1.The reporter noted there was a serious lack of resources available to us then
2.They admitted the earth was over populated then.
3.Anna said to ride a bike was good for the environment and great for our health.
4.Scientist warn oil spills damage the prime source of water for various cities marine life and even affect birds /Обратите внимание, здесь главное предложение в настоящем.
5.Our teacher explained to us that many chemicals destroyed the ozone layer because they interacted with ozone.
6.A famous ecologist said the use of nuclear energy had led to the threat.
7.The author of the article stated the high amounts of air pollution were caused by the development of several industries and water pollution.
9.I asked myself what the ingredients of these cleaning products were.
Объяснение:
1. While I was looking for my keys, I suddenly remembered I had left them at home.
2. In those days the unions used to go on strike whenever there was a problem.
3. After they were had bought the company, they started to make a lot of people redundant.
4. Jack used to have a Mac, but then changed to a PC.
5. I asked about my package in reception, but they said that it still hadn’t arrived.
6. I was sure that I had locked the door to my office last night, but it was open this morning.
7. I’m sure that the winters used to be colder when I was a child. I remember that we were walking to school in the snow every winter.
8. I went back to the restaurant to look for my umbrella, but found that someone had taken it.
9. When George saw Diane at the seminar, he knew that he had met her somewhere before.
10. While I was having breakfast I looked at the financial pages to see the share prices. I saw that my original investment had grown by over 40%.