阅读下面短文，在空白处填入1个适当的词或括号内单词的正确形式。
Did ancient people plant trees? They didn’t have a special day to plant trees like Tree Planting Day, 1． the tradition of planting trees has been there for a long time. Back then, it was always 2． (rain) around the Qingming Festival in spring. The trees that were planted around this time had better conditions to grow than usual, so people formed the custom of planting trees around the Qingming Festival.
There were many kinds of trees. However, mulberry trees (桑树) and fruit trees were the 3． popular of all. To feed the silkworms (蚕), more mulberry 4． (leaf) were needed. Silk came from the silkworms, and then was made into silk clothes and traded between the east 5． the west of the world. Among the ancient people who suggested 6． (get) trees to offer food and clothes, there was a man whose name is well-known, Mencius (孟子).
Dong Feng, a famous doctor in the Three Kingdom Period (三国时期), saved many 7． (patient) lives for free. He only asked them to plant apricot trees (杏树) on a hill. Gradually, a forest of apricot trees 8． (grow) on the hill. That’s why we now praise a doctor who has excellent skills with the words “warmth in an apricot forest”.
Each dynasty (朝代) 9． (have) different tree planting projects. Li Shimin, Emperor Taizong of the Tang Dynasty personally planted a ginkgo tree (银杏树) in a temple in Chang’an. 1,400 years later, the ginkgo tree is still growing. So far, the temple has become a popular place for tourists.
So, Tree Planting Day next year, do you want to plant a tree with 10． (you) wishes on it?
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