阅读下面材料,在空白处填入适当的内容(每空不多于3个单词)或括号内单词的正确形式。
China's Tea Villages
In most Chinese tea villages, March is the time of year in ______ locals start to pick and process tea. The usually quiet villages suddenly become busy centers of activity, as people take out special tools and prepare ______ tea processing. In some villages, local residents hold traditional ceremonies, _____ (thank) heaven for its blessing. The price of tea ______ (pick) in March is extremely high because _____ is fresh, tender and contains multiple trace elements.
China ______ (be) famous for tea production since ancient times. Of the goods transported and traded along _____ Old Silk Road linking China to the Middle East and Europe, the importance of tea was matched only by silk. China produces Oolong, black, green, white, yellow _____ dark (aka post-fermented) tea. The Oolong, green and black _____ (vary)are most notable for their high quality.
Most of China's tea villages are found in remote mountainous areas in the country's south and southwest, _____ the beautiful scenery is often hidden under clouds.