Verb conjugation of "undo" in English

That was really cool. I flew from Koppenhagen to Thailand and did not know until take off where I wanted to go from Bangkok. We left Germany after midnight. I was really excited to go to a new place.
I remember once again how I failed as a student, mainly in French class. Since I have lived in Russia, it was not easy to learn other foreign languages. The alphabet is also different.
Have you ever visited the U.S. before and if so, where have you been in the U.S.? I've been travelling in California, it was very amazing. We have traveled by car. Here are my corrections.