He gave up __ football when he got married.

দুটি verb পাশাপাশি থাকলে বা preposition-এর পর verb + ing (gerund) বসে। তাই playing সঠিক।

সম্পূর্ণ বাক্য: He gave up playing football when he got married. (বিয়ের পর তিনি ফুটবল খেলা ছেড়ে দিয়েছেন।)

Give up doing something:

• I gave up going to the theatre when I moved out of London.
• Why don't you give up smoking?
• I gave up playing cricket when I got a job.