Task Ten of Unit 4, on P.129

1. Attractive people have more favorable personal attributes than unattractive people.

In most cases, attractive people have more favorable personal attributes than unattractive people.

2. Economic sanctions are ineffective.

According to the history, most economic sanctions are ineffective.

3. Alcohol causes people to become violent.

Sometimes alcohol causes people to become violent.

4. Passive smoking causes cancer.

Many studies indicated that passive smoking may cause cancer.

5. Recycling is the best solution to the waste disposal problem.

Recycling may be one of the best solutions to the waste disposal problem.

6. Physical exercise prevents depression.

Physical exercise may be useful in preventing depression.

7. Deep tunnels are safer and less vulnerable to earthquake shaking than are shallow tunnels.

Some research shows that deep tunnels are safer and less vulnerable to earthquake shaking than are shallow tunnels.

8. Private schools provide a better education than do public schools.

In some countries, private schools may provide a better education than may public schools.