Pronunciation of digraphs beginning with the letter "a"

Ex. Look at the following words containing the letter "a" and put them in groups according to the sound that the digraph beginning with an "a" represents. The options include short vowels, long vowels and diphthongs.

1. /ɑː/ 2. /ɔː/ 3. /aʊ/ 4. /eɪ/ 5. /eə/ 6. /iː/ 7. /ɒ/

aardvark
aerial, algae,encyclopaedia, maelstrom
gait, hair, lair, maim
chaos, Laos, Taoism
auburn, auction, Australia, authority

KEY
1. /ɑː/ aardvark 2. /ɔː/ auburn, auction, authority 3. /aʊ/ Laos, Taoism
4. /eɪ/ chaos /'keɪɒs/, gait, maelstrom, maim,
5. /eə/ aerial (the second "a" is /ə/), hair, lair
6. /iː/ algae, encyclopaedia
7. /ɒ/ Australia

When in doubt, I consulted the Cambridge Dictionary at dictionary.cambridge.org.