我是加拿大PR的，想过去美国探亲戚。准备在多伦多搞签证。
Proof of sufficient funds to cover all expenses while in the U.S.
Proof of ties/residence in a country outside the U.S. which have no intentions of abandoning.
Evidence which show the purpose of trip.
请问这两个proof和一个evident需要什么文件?