Misc: What is a group of bats?

Questions

If you want to do something with strict adherence to the rules, you would do it "according to ..." This expert on the rules of card games?

If you were relaxing in the Piazza San Marco, what city would you be in?

If you were to spell out numbers, how far would you have to go until you would find the letter "a"?

'Impala' is the name of a southern African antelope. English borrowed it from which language?

In "Alice & Wonderland", what color hat does the Mad Hatter wear?