you know, i sat there for ages thinking, none of these answers are right...and then i realised that a 'very careful' person wouldn't touch the water when handling a hose or flushing the toilet...
dude...you seriously need to calm down a little. Doing standard english in no way means your life is screwed - if you do really well in standard english, it's a whole lot better than doing less than average in english adv.
That sucks, i have a really awesome chem teacher actually - he teaches directly via the syllabus and our class notes are under syllabus dot points so its really easy to study from. Oh and he's funny as hell :p