题目内容：

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Tea is one of the 1. (much) popular drinks in the world. You make it by pouring hot water over the dried leaves of a tea plant. For 2. (hundred) of years people believed that tea could cure illnesses, and they used 3. as medicine. Today scientists know that tea contains chemicals that prevent cells from dying. Most teas have caffeine in them, 4. makes you feel more active. Some people have problems 5. (drink) tea because it can cause sleeplessness.

The tea plant 6. (grow) best in tropical and temperate places where rain falls throughout the year. Teas can be grown from sea level 7. about 2,000 metres, but the best quality grows in higher regions.

Tea comes from the leaves and buds of tea plants. Wild plants can be up to 9 metres high, however, on tea plantations, 8. (pull) the leaves 9. (easy), people cut them back to a bush of about a metre in height. It takes a plant three to five years before it is ready for picking.

A picker can harvest about 20 kg of tea a day. On large tea plantations the leaves are harvested by machines, but the quality of tea is 10.(high) when the leaves are picked by hand.