Задание по английскому языку

Choose the right word:
1.Where do you keep your _______________ of badges? (collector / collection)
2.I didn’t like their __________________. (performance / perform)
3.My father is a real __________________ in gardening. (special / specialist)
4.When did you begin to ________________ toy cars? (collect / collection)
5.What is the __________________ of your collection? (thematic / theme)