Given a travel related situation, and given a specific question about the situation, summarize the question into a title

[EX Q]: Arrival cards, Immigration cards, Custom declaration cards at airports often have a field that asks for home address/country of residence, etc...

What if a backpacker no longer maintains a residence and therefore has no home address (and has no family that has a home address either)? How should a backpacker fill out that field? Should he leave it blank? Can he write a non-residential mailing address instead? Do immigration/custom officers even care about that field?

[EX A]: How should a backpacker fill out home address field in immigration/custom cards

[EX Q]: I am a doctor and I want to give my plab 2 exam in the UK.  As I am a recent graduate my father is supporting me financially. He is a retired government officer who gets pension, rents from his properties and interest from his fixed term deposits. Please tell me that how should I maintain his bank statement for 6 months, and is my employment necessary to get a visit visa as I heard from many guys that it shows ties back to your country.

[EX A]: How to maintain 6 months bank statements for UK visit visa?

[EX Q]: I've got a long-haul flight booked with China Airlines (A330 and an A340) from LHR to SYD, and only after I booked it did I decide to read up on their safety record. Suffice to say I regret doing that; for example see their Wikipedia page.

Does anyone have any experience with China Airlines? Am I being a wuss?

I'm considering cancelling my flight (it's a long way off yet anyway) and rebooking with someone I've flown with before (Singapore or Virgin Atlantic probably).

Edit: Just to clarify, I understand all airlines have issues; however, I'm slightly concerned that China Airlines seem to tend to have more "and there were no survivors" kind of issues.

[EX A]:
China Airlines, safe?