Words are teh interesting.
WHAT DO YOU CALL:
1. A body of water, smaller than a river, contained within relatively narrow banks?
"Stream", or "beck" further north.
2. The thing you push around the grocery store?
Trolley (And yeah, it's a supermarket, not a grocery store)
3. A metal container to carry a meal in?
Lunchbox, I suppose, only lunchboxes are plastic, generally, and have pictures of gender-specific cartoon characters on the sides, and are carried primarily by schoolchildren and mentally subnormal teenage goths.
4. The thing that you cook bacon and eggs in?
Frying pan.
(Or - "OPRESSIVE PAN OF FILTHY DEATH!!1!", and then I go and post some turds to KFC).
(PS - I'm kidding)
5. The piece of furniture that seats three people?
Settee... John got me calling it a "couch". My grandparents call it a "suite".
6. The device on the outside of the house that carries rain off the roof?
Gutter, drainpipe.
7. The covered area outside a house where people sit in the evening?
The American covered area outside a house where people sit in the evenings is a porch. The narrow, toilet-sized covered area where the British keep their prams and old newspapers is also a porch. If you wanted to sit outside a British house of an evening, you'd be sitting on the pavement, or in the shed. In the rain. (Drinking tea!)
Edit: I just thought! My grandparents have one of these, and it's always been a verandah. Which, incidentally, sounds like the next wave of Inventive Names For Sprogs®, god have mercy on all of us.
8. Carbonated, sweetened, non-alcoholic beverages?
By brand name or specific product (Coke or lemonade, f'rinstance) - I sound silly saying "pop, and I wouldn't even consider "soda" as anything other than a white powder used for baking and padding out drugs.
9. A flat, round breakfast food served with syrup?
A flat, round, paper-thin food served on a Tuesday with sugar and lemon juice is a pancake. If you're having a flat, round, syrup-covered item for breakfast in Britain then you're probably eating your placemat.
10. A long sandwich designed to be a whole meal in itself?
"A long sandwich designed to be a whole meal in itself" - I can get my head around the idea of a sub, and I suppose I'd call it that if we were going to Subway - otherwise it's just a sandwich. And who eats a sandwich as something other than a meal in itself, anyway?
11. The piece of clothing worn by men at the beach?
I dunno... Swimming trunks, probably.
12. Shoes worn for sports?
Trainers (Also used for running away from police, kicking ethnic minorities in the head, etc).
13. Putting a room in order?
Tidying.
14. A flying insect that glows in the dark?
Firefly / genetically engineered mosquito.
15. The little insect that curls up into a ball?
Woodlouse? I seem to have an idea that the little bastards are *supposed* to do that, but I've never seen them do it. Personally, I used to race them. (I mean, against each other. Racing against a woodlouse - what kid of fucked up kid do you think I was? Pls not to be answering)
16. The children's playground equipment where one kid sits on one side and goes up while the other sits on the other side and goes down?
See-saw
17. How do you eat your pizza?
Cut into triangular slices with scissors, shovel into face. (You mean, can I eat it with a knife and fork? I can manage that, but without cheese to stick it together it's not so attractive and will inevitably result in spillage)
18. What's it called when private citizens put up signs and sell their used stuff?
Redundancy. (Do we have garage-sale type things here? It's more car-boot sales, I suppose)
19. What's the evening meal?
Beer.
(Tea... John got me calling it "dinner")
20. The thing under a house where the furnace and perhaps a rec room are?
Cellar, only if you found one in Britain it would be full of spiders, tinned food, and bodies damp.
21. A window covering on rollers that pulls down.
Blinds
22. A new, limited access, multi-lane road.
Ehrm. I'd probably call it a "toll road", or a "bloody nuisance".
23. Heavy garments worn by mechanics or other people who don't want to get their regular clothes dirty
Overalls.
24. The highest grade of gasoline?
There are grades of it? Anyway, it's petrol. Yeah, it is.