---My hobby is old coins what about you?---In my free time I like in the park.A. collect

问题补充：

---My hobby is old coins, what about you?

---In my free time, I like in the park.

A. collected; painting

B. collects; to paint

C. collecting; to paint

D. collect; painting

答案：

A. collected; painting

B. collects; to paint

(答案→)C. collecting; to paint

D. collect; painting

解析：本题的第一个空作表语，通常不用动词原形，用动名词doing或动词不定式to do，故本题选C。