Our body ____ many systems that work at the same time. We use our ____ system when we ____ and drink. After we swallow the food ,it goes to our stomach. Then, a special liquid ____ the food into energy and nutrients. However, when we breathe, we use our ____ system____ breathe in air through our ____ and it ____ to our lungs____ the oxygen in our lungs ____ passed to the blood.

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