Combined Qualifications
1. Attractive people may have more favorable personal attributes than unattractive people.
2. Economic sanctions may be ineffective.
3. Alcohol may led people to become violent.
4. Passive smoking may result in cancer.
5. Recycling may be the best solution to the waste disposal problem.
6. Physical exercise may reduce depression.
7. Deep tunnels tend to be safer and be less vulnerable to earthquake shaking than are shallow tunnels.
8. Private schools may provide a better education than do public schools.

2 Comments:
The verb "led" after "may" should change to "lead"
Your revision of combined qualifications are almost correct. But, it seems that you prefer to use "may."
3. may lead
7. Deep tunnels tend to be safer and be less vulnerable to earthquake shaking than are shallow tunnels.
--> ... than do shallow tunnels.
8. Private schools may provide a better education than do public schools.
--> ... than may public schools.
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