题目内容：

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Tea is one of the1.(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 problems5.(drink) tea because it can cause sleeplessness.

The tea plant6.(grow) best in tropical and temperate places where rain falls throughout the year. Teas can be grown from sea level7.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 tea10.day. On large tea plantations the leaves are harvested by machines, but the quality of tea is higher when the leaves are picked by hand.