Sentence Changing

1. In some circumstances attractive people may have more favorable personal attributes than unattractive people.

2. According to simulation studies, economic sanctions might be ineffective.

3. In some circumstances alcohol could cause people to become violent.

4. Based on the limited data available, passive smoking may cause certain types of cancers.

5. From some studies, recycling might be one of the best solution to the waste disposal problem.

6. In the view of some experts, physical exercise could prevent depression.

7. In some circumstances deep tunnels may be safer and less vulnerable to earthquake shaking than shallow tunnels.

8. Certain kinds of private schools might provide a better education than public schools.