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`1.` A

- D/c: The most obvious advantage of living green is that it helps reduce environmental pollution.

`2.` C

- D/c:  Reducing the use of energy and water can help save money on household bills.

`28.` C

- D/c: There are also economic benefits to living green. Reducing the use of energy and water can help save money on household bills. Furthermore, reusing products and materials is another way to make saving. It helps save on production costs since creating new products wastes materials and is expensive. Recycled products also last longer than new ones, making them a better and more eco-friendly option.
Lastly, going green offers health benefits. It reduces air pollutants by making the air we breathe cleaner and healthier. This means fewer diseases and doctor's appointments.

-> Phía trên không hề nói đến lợi ích cộng động -> `C` sai