Hypothetical morality scales. This is a controversial minefield (< metaphor)

"To wait on" has a secondary meaning of acting like a waiter/waitress. 'To wait on the 1st class passengers was a part of the flight attendants' job' (I don't know if that's true but it makes the point)

A Pit is common in some fruits. Cherries, avocados, and peaches are some that all have a pit..A pit is the part of the fruit that protects the seed until growth time. A very hard and large pit. It was common for people to choke on them in older times, common enough that the feeling is still used in our language. "It felt as if I had a pit in my throat."

"I might well [do something]" means "I am quite likely to [do something]". It's a stronger version of "I might". "I might as well [do something]" means "[Doing something] is at least as good as any other option I have at the moment". It can be used practically to indicate something you DO intend to do ("While that report's running, I might as well go and get a cup of coffee.") or more figuratively to indicate a futile action that you DON'T actually intend to perform, but if you did would be no less useful than the alternative ("It's no use talking to him; I might as well hit my head against a brick wall.").

Obvious answer: practice Sorry I can't help, but I saw this and wanted to wish you good luck in your endeavours

"The last word" is an expression that something is the best. It would literally mean; we are talking about (Second homes to ride out the apocalypse) and when somebody says (New Zealand) the conversation stops because there is no way to argue a better point. (New Zealand) is the last word

It is a widely "believed" myth that that material prosperity makes people happy. In this case.

Luiz has your answer I'm just here to say it's not impolite to mess up these words, they are very much woulds used for clarifying what you are saying.