Choose the correct options to complete the letter

Dear Tom,

Thanks for your letter. It was great to hear from you. [At last,|To start,] I'd like to say sorry because I haven't written to you for so long. I'm [after all, |also] so happy that you've decided to visit me next month.

You know that the weather here is so changeable. [So,|Because] please, take some warm clothes with you. I'm already planning our weekend together. [Firstly,|Thirdly,] I'm going to introduce you to my friends. [Finally,|Next,] we're going to walk around the city. [In the beginning,|Finally,] I'm going to invite you to my concert.

Well, it's time for me to finish. It's already 10 o'clock.

Take care,

Mia