Need major help with sentences grammatically please?

Could you please help me correct these sentences grammatically?

1 The way you are walking, we get there in an hour.
2 She can die at any moment. Her heart might give out.
3 She isn't so smart that she would stay long enough for me to do such a thing.
4 The hotel is bound to have a free room on 1st floor within a week of christmas.
5 They can't see anything of what I'm going to do.
6 Until what number do you know how to write roman numerals in?/How big a number can you count to in Spanish?

Thank you