Read the texts carefully. Then, answer the questions that follow.

            Proper ventilation keeps the air fresh and healthy indoors. Like the lungs, homes need to be able to breathe to make sure that fresh air comes in and dirty air goes out. Air indoors can buildup high levels of moisture, odors, gases, dust, and other air pollutants. To keep the air safe indoors, fresh outdoor air is needed to dilute these indoor pollutants.

           To provide good air quality, we should have enough air to be brought in and circulated so that it reaches all areas of the home. For almost all homes, windows and structural elements contribute to bringing in fresh air. Many homes have additional mechanical systems to add to the flow. Some sources, such as stoves and bathrooms, need special venting that can remove the pollution they produce. Ventilation above stoves needs to carry the air outside to avoid redistributing pollutants from cooking inside the home.

          Ventilation helps reduce indoor air pollution, but it works best if paired with keeping known sources of air pollution out of the building. For example, the only way to reduce the effect of secondhand smoke indoors is to not allow smoking indoors or near the entrances. Ventilation will not solve that problem. Outdoor air can also bring pollution indoors as well, so taking steps to reduce outdoor air pollution is important, too.

In the sentence, “Outdoor air can also bring pollution indoors as well, so taking steps to reduce outdoor air pollution is important, too.”, what modal verb was used?

“To provide good air quality, we should have enough air to be brought in and circulated so that it reaches all areas of the home.” What is the purpose of the modal verb used in this sentence?

Based on the text, how can we maintain the proper ventilation of the house for a healthy respiratory system?

Why it is important to keep the air fresh and healthy indoors?

The size of the room helps in maintaining good airflow in and out of the house. Given that the room has an area of 25 m² and a perimeter of 20 meters. Find the dimensions of the square room.

What environmental problem reduces the ability of soil to store water and support plant growth?

Which of the following is NOT a good form of communicative style to spread awareness on environmental issues?

Below is NOT a threat to species extinction.

Which of the following is the main cause of the extinction of several species?

How do we prevent species extinction?