4 looks like a mini rex to me, the fur is short enough.... face and shape seem right.
the last few were almost too young to tell!
3 is probably a mismarked dutch (probably why it's a pet, and in a shelter -- can't be used for breeding, breeder may not have sold to the "right" people, or something came up)
2 could be a mix with dutch, but is too poorly marked and the wrong colour to be a mismarked dutch.
The fur isn't right on 7 to be a mini rex --- I'm not sure what that one is, but it's not the right fur...