Choose the correct options.
1. Are you interested in learning/to learn how to ski?
2. It's difficult opening/to open this box.
3. I'm staying at home helping/to help my mum.
4. He apologised for upsetting/to upset me.
5. I decided inviting/to invite everyone to my party.
6. She used to love going/to go to parties.
7. Swimming/To swim is the best form of exercise.
8. Do you enjoy watching/to watch documentaries?
9. The children pretended being/to be pirates.
10. When did you stop playing/to play the piano? "When I was thirteen."

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