I、单项选择 (共15小题；每小题1分，满分15分)
从 A、B、C、D 四个选项中，选出可以填人空白处的最佳答案。
1. My grandpa used to play _____ violin after dinner, but now he is used to playing _____ chess with me.
A. /; a B. the; / C. the; the D. the; a
2. Daniel is polite and helpful. He is a good friend of _____.
A. mine B. my C. me D. I
3. Kitty is fond _____ dancing, but she spends little time _____ it this week because of the coming exams.
A. of; in B. of; on C. about; on D. about; in
