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 the{#blank#}1{#/blank#}(much) popular drinks in the world. You
make it by pouring hot water over the dried leaves of a tea plant. For {#blank#}2{#/blank#} (hundred) of years people believed
that tea could cure illnesses, and they used {#blank#}3{#/blank#}as medicine. Today scientists know that
tea contains chemicals that prevent cells from dying. Most teas have caffeine
in them, {#blank#}4{#/blank#}makes you feel more active. Some people
have problems{#blank#}5{#/blank#}(drink) tea because it can cause
sleeplessness.
The tea plant{#blank#}6{#/blank#}(grow) best in tropical and temperate
places where rain falls throughout the year. Teas can be grown from sea level {#blank#}7{#/blank#}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,{#blank#}8{#/blank#}( pull ) the leaves {#blank#}9{#/blank#} (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 {#blank#}10{#/blank#}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.