根据句意及首字母提示，完成单词拼写。

1. Mary comes from A   ___.

2. My grandmother likes taking p    __.

3. This hamburger is very d    __.

4. My grandpa was a teacher. But now he is r      _.

5. I want to buy a d         for learning English.

试述顾恺之在中国绘画史上的地位。