#6 and #7 are roos - I'm suspicous about #8 too, but need a new pic on that one. So far, at least in these pics, the rest look like females to me, but they could be slow starters. By 8 weeks it should be more obvious.
These are what my Aust and BO roosters looked like at about 8 weeks of age:
Australorps; Female on the left - male on the right: