问题补充：
基础训练篇（8）
(1) is known to all, China is a large country (2) agriculture. Science of farming was first (3) (study) here.
Jia Si-xie, living (4) the 6th century AD, was one of the farming pioneers（先驱者）. After he finished his work for the government, he spent his time (5) his research into agriculture. He studied (6) to keep seeds, how to improve soil conditions and so on.
During the years 533~544, he wrote a book (7) (call) Qi Min Yao Shu ,(8) is about both farming and gardening, (9) (include) advice on how to grow green vegetables, how to keep fish in lakes, and so on. It was considered to be (10) important summary of farming knowledge.1. As 2. of 3. studied 4. in 5. on / doing
答案：
(答案→)1. As 2. of 3. studied 4. in 5. on / doing
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