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Do these sentences sound natural?

5 years ago
1. I need to go buy some big boxes to pack my stuff in my room, because I am leaving here for the US soon.
2, I felt like the professor wasn't being clear at class, I am not sure what he wanted us to do for the project.
3. If I couldn't pass the national exam this time, I kind of have to live of the situation.
4. I would have gone on a date with her if I had chance, but it seems it's a long shot for me to do anything now.
5 He has been stepping up his efforts in learning how to do this the right way, so don't be too hard on him.