[求问]父母访问签证申请，机票、医疗保险如何提供？

lufthansa

check list 上要求包括如下两项：
3 j% w+ X9 U4 D1）Photocopy of your valid return ticket and/or travel itinerary, if applicable 因为只有拿到签证后才会购买机票，此项文件可否不提供？
3 g3 C- @% B! M4 z% v7 e% N2 p2）Proof of medical insurance coverage for one year with a Canadian insurance company (copy of the insurance certificate or policy) 这一项材料大家一般是如何处理的？