VII.
1. B
2. B
3. D
4. A
5. B
6. B
VIII.
1. Yes, it can.
2. If we didn't waste so much energy, our resources would last longer.
3. Many countries are spending much more time and money on research because the energy from the sun, the waves and the wind last forever.
4. Unless we start working on cleaner and safer sources of energy, we won't survive.
IX.
1. If you are not careful, you'll fall off your bicycle.
2. He got wet because he forgot his umbrella.
3. My father prefers doing the garden to watching TV.
4. Because Mai was sick, she could not go to work.
5. No one in his class is taller than him.
6. During the week I wake up earlier than at the weekend.
7. The college, in which I study, is quite near my apartment.
8. The classrooms are kept clean by the school keeper every day.
9. We play tennis once every week, on Wednesday afternoon.
10. I wish I had finished my homework last night.
11. I'm interested in reading scientific books.
