1. can i apply for it at the airport if i am not flying but driving.
2. do you know the regular hours fot TN1 processing, i mean not just the pre-screening, are they open during the weekends?
3. if you have a master's degree from a canadian university, do you also need to prepare your degree and transcript from china?
4. is there any need to provide your previous working experience, like former employers?
5. can i apply for the TN1 at any custom, not necessarily the one closest to the city you are going?

Thank you so much for your help, and congrats you got your TN1!