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3. study 4.eat 5.play american football 6.write a card 7.practice piano 8.swim in the pool 9.paint a mural 10.listen to the band 11.dance at a party 12.drink milk 13.visit panama 14.open the card 15.prepare dinner 16.stay in the house 17.watch tv 18.write on the paper 19.study spanish 20.examine the paintings in the museum. i hope this : )

Cuando una persona es vieja, se cree que es mas joven. 

This is not enough information. what exactly is your question

The correct answer is:   [b]:   "an infinitive" .