Pronunciation of "s" and "ss"

To create this exercise, I used Teflpedia: https://teflpedia.com/Decoding_the_letter_S and Cambridge Dictionary: https://dictionary.cambridge.org .

Ex. Put the following words in categories depending on their pronunciation of the letter "s" or "ss".

Arkansas, cosy, passion, measure, trousers, mission, pleasure, lose, loose, vision, island, pressure, precision, seat, sugar, soup, Aussie, dinosaur, Sean, Siobhán (Celtic names), basic, possess, ensure, class, inclusion, aisle, phrase, invasion, release, isle, desert, dessert

1. /s/   2. /z/   3. /ʃ/ 4. /ʒ/   5. silent

KEY
1. /s/ loose, seat, soup, dinosaur, basic, class, release  2. /z/ cosy, trousers (both /z/), lose, phrase, desert, dessert, Aussie, possess   3. /ʃ/ passion, mission, pressure, sugar, Sean, Siobhán, ensure 4. /ʒ/ measure, pleasure, vision, precision, inclusion, invasion  5. silent: Arkansas, island, aisle, isle