1) You must be Steve, RIGHT?
2) if you had made the reservation beforehand, we wouldn't need to overpay.
3) All the flights were postponed with regard to THE storm that started yesterday.
4) Some of the students get the hang of - school - easily while the other need to make big efforts to achieve the same level.
5) There were quite a few options WHERE I COULD'VE STARTED my professional career. But i kept on going back and forth and I couldn't make UP my mind.
ANSWER THIS QUESTION
Great effort ! The mistakes were minimum. in the last sentence, because of the second part of it that is written in past tense, I corrected the first part.
Keep on the good work!
Best of luck!
Rodrigo
You can check out my profile and I can help you improve your English.