I have been away from the world of cacti and succulents a good while but I think: 1, 2 , 5 = all opuntias and are cacti 3 = cereus? but definitely a cactus 4= echevaria (succulent) 6 = cactus, can't think of species, possibly echinocereus 7 = guess at a sedum or crassula (succulent) They are all common so I'm sure you can find out exactly what they are either by trawling the web or getting a beginner's guide to cacti and succulents.
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1, 2 , 5 = all opuntias and are cacti
3 = cereus? but definitely a cactus
4= echevaria (succulent)
6 = cactus, can't think of species, possibly echinocereus
7 = guess at a sedum or crassula (succulent)
They are all common so I'm sure you can find out exactly what they are either by trawling the web or getting a beginner's guide to cacti and succulents.