Make the sentences academically respectable and defensible

1. It is probably that attractive people may have more favorable personal attributes than unattractive people.
2. Economic sanctions in some circumstances can be ineffective.
3. Based on an informal survey of 100 workers, alcohol may highly causes people to become violent.
4. Passive smoking may be possible to causes cancer.
5. Recycling is an advantage solution to the waste disposal problem.
6. In the view of some experts, physical exercise can reduces depression.
7. It is highly that deep tunnels might be safe and less vulnerable to earthquake shaking than shallow tunnels.
8. Perhaps, private schools provide a better education than public schools.