Mav, your previous post on this was answered. Check page 2 of this forum. As for your sentence, the correct form would be "I have to use 'Till 5 o'clock', don't I?". You may interchange until, till, and 'til with one another.

Try the local newspaper. When I taught there a year ago, the classifieds were chockful of ads looking for English teachers.

1. Correct. It means that at every 10th minute mark, you (we) do this. Very similar in meaning to 3. 2. Not ok. The singular must be used but not because 10th is an adjective (numbers are adjectives when modifying a noun). It's because 10th

Thanks a mil, Mr M! This info would come in very handy when I take the CELTA in February. Might be just the thing I'd need to get an 'A'. Strange, I don't remember this being taught in TESOL class. Wait 'til I begin my next American Accent class

Hi, Nona! I agree that you'd always be correct if you pronounce the "g". But I don't think not pronouncing it is considered sloppy. It even sounds more natural to me.

Don't you mean "ladder"? Additional 'flap-t' words: water city party meeting Mister M, thanks for providing the term 'flap-t' for the /d/ sound in these words. I wasn't aware there was a word for it. I just tell my call center

I agree with Nona that you have to use "tenth" in 3 and 5. Although this form isn't used nearly as often as "...every ten minutes...", use "tenth" in 7 to make it grammatical. Assuming you got no more than 10 paychecks last year, use "all" instead

For nouns that end in f: leaf - leaves loaf - loaves elf - elves dwarf - dwarves (I could've sworn this was spelled "dwarfs" when Disney first came out with "Snow White and the seven...") reef - reefs oaf - oafs

Use the singular for "women".

This is a common problem with a lot of English exams and reviewers. There would be questions that have multiple possible answers but with only one considered correct by the author or examiner. This would be ok if a sample sentence was included.