Here are the best options to fill in the blanks:

1. Mark is **enthusiastic** about sport, and he can play basketball, football, table tennis, and golf.
2. Are you keen **on** gardening or going shopping?
3. Many girls are interested in **doing** DIY.
4. My mum and I love **cooking**, so we can spend hours in the kitchen.
5. Is your grandfather **fond** of collecting stamps and coins? – Yes, he is.
6. What does your brother do in his free time? – He usually **surfs** the net.