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Fill in the blanks with the correct form of the verb in brackets.
The heart is a pump that ............. (send) the blood circulating through our body. The pumping action ............. (take place) when the left ventricle of the heart ............. (contract). This ............. (force) the blood out into the arteries, which ............. (expand) to receive the oncoming blood.
The heart is a pump that sends the blood circulating through our body. The pumping action takes place when the left ventricle of the heart contracts. This forces the blood out into the arteries, which expand to receive the oncoming blood.
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