Exercise 8: 9. During the storm, the power went out and we had to use candles for light. 10. Many athletes compete for the chance to represent their country in the Olympics.

Exercise 9:

1. I need to refer to my notes before I can answer that question.
2. Let's plan a trip to the beach for next weekend.
3. Travelling to new places is a great way to gain experience and broaden your perspective.
4. The company will hold a meeting next week to discuss the new project.
5. I was in a hurry this morning and forgot to grab breakfast on my way out.
6. It's polite to greet your host when you arrive at a party.
7. Walking is a great way to get some exercise and enjoy the fresh air.
8. Many athletes compete in the annual marathon.
9. I want to take part in the charity event to help raise money for cancer research.
10. She has a sore eye and needs to see an optometrist to get it checked.

Exercise 10:

1. Children can enter for free, while A. adults are required to pay an admission fee.
2. Regular exercise can improve your physical and mental health.