Choose the correct options to complete the text
Introductory verbs: reported speech
There are some introductory words which are used in reported speech:

• agree/offer/promise/refuse/demand/threaten + to + inf;
• advise/beg/command/invite/order/remind/warn + sb + to + inf;
• admit / accuse sb of / apologise for / boast of (about) / complain to sb of / deny / insist on / prefer / suggest + gerund;
• agree/explain/complain/deny/exclaim/remark/promise/suggest + that-clause.

Note:admit, advise, boast, insist, threaten, warn, remind can also be followed by a that-clause in reported speech.

I saw Helen the other day, and she was very sad. I asked her what'd happened, and she told me her story. She explained [that she was going to have|having|to have|her to have] a gap year travelling in Europe after school. She preferred [to see|seeing|that she saw|saw] the world before entering the university because she thought that could help her to develop some skills and get new knowledge. She begged her parents[to let|that let|let|letting] her go to Europe, but, unfortunately, they refused. She even promised them[not to have|not having|that she didn't have|she would not have] any Bs in her exams but it didn't help. When I saw her, she was really disappointed, and I didn't know how to comfort her. I advised [to let it|letting it|her to let it|that it let] go and try to focus on her studies. Also, I supposed that her parents could change their mind in the future.