________ old man behind Mary is ________ university teacher.

A.An, an B.A, the C.The, a D.The, an

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Every living thing on the earth is made up of cells (細胞). Cells grow and make new cells. Most cells are very small and we can’t see them with our eyes. Different cells have different uses. Our skin cells are special ones. The cells on the surface (表面) of our skin are old dead cells. New skin cells are right under the outside. These are the living skin cells. They work for our bodies. They help protect our bodies and heal ( 復原,治愈) cuts.

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6.to work

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there’s no gap.

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