改写定语从句（两种方法）

解题思路： 找到两个分句中共同的部分，决定哪句是主句，哪句是从句。注意从句中先行词不再出现。
解题过程：
1.Sharon gave me a picture for my birthday.She had painted it especially for me.
Sharon gave me a picture （which/that）she had painted especially for me for my birthday.
2.When I went on a tour round China,I saw many historical sites. It was very exciting.
When I went on a tour round China,I saw many historical sites，which was very exciting.非限定性定语从句。
最终答案：略