问题补充：
基础训练篇（13）
Xiao Mao is a primary school student and he enjoys (1) (draw) very much.
One day, he went to the small woods not far (2) town to draw from nature, carrying a drawing board. He was glad to find a tree living (3) the rest had been cut down. “Let me start work at (4)” he thought and began to set up his (5).
Just then a strong young man came (6)a big axe and got down to (7) (cut) the tree. Soon he cut it down and pulled it away.
When Xiao Mao got (8) and turned back to draw, he found the tree had (9) (disappear).
“Dear me ! Where on earth is the tree ? ” Xiao Mao wondered, very (10) (disappoint).1. drawing 2. from 3. although 4. once 5. board
答案：
(答案→)1. drawing 2. from 3. although 4. once 5. board
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