3. I'm sure I'm gonna meet so many people that I'm very to meeting new people.

Для ответа на вопрос обратимся к тексту:

And from now I'm still young and I'm going to be working and I'm gonna be travelling. I'm sure I'm gonna meet so many people that I'm very looking forward to meeting new people.

Вставим пропущенные слова:

I'm sure I'm gonna meet so many people that I'm very looking forward to meeting new people.

Ответ:looking forward