1. That the lifestyle is slower and healthier is the reason why some people prefer to live in the country rather than in the city.

2. That people cut down too many trees destroyed the balance of nature.

3. It was reported that Los Angeles Lakers basketball legend Kobe Bryant was killed in a helicopter crash in Southern California.

4. Whether we can live a healthy life is the first thing we are considering.

5. How we can find a suitable solution to produce sufficient food while keeping the environment safe is an important topic for us to research.

6. That we shall be successful is certain.

7. When these wheat farmers will join this pilot experiment remains (remain) an unanswered question.

8. What worries most of us is that the chemicals may even cause cancer.

9. Who will win the match is still unknown.

10. That they should like each other is natural.