1. Your ears, eyes, tongue, nose and skin are your sense organs

2. Hot water through the heating system circulated

3. The operation putting a small tube into your heart involves

4. The research the effects of alcohol on long-term memory examined

5. Blood are the narrow tubes through which your blood flows vessels

6. Blood carries through the body oxygen

7. Tom has just installed an alarm in his house system

8. The human body is composed of billions of small Submit cells

1. organs

2. circulated

3. involves

4. examined

5. vessels

6. oxygen

7. system

8. cells