1. I usually avoid eating sandwiches and hamburgers.
2. I'm happy to see my friend at my birthday party.
3. It's not worth reading this book.
4. There's no point feeding a shark.
5. I spend a lot of time reading interesting books.
6. I don't mind joining a volleyball section
7. I can't stand listening to classical music.
8. I prefer studying history to geography.
9. I love swimming in the sea.
10. I really want to enter the university.
Здесь объяснение простое. После выражений, за которыми стоит ing, всегда да употребляется герундий, то есть-ing form.
