Bumping this thread on the off-chance that someone can get some use out of it.
Also, I just realised that I can filter the old threads by least-posts first! [maniacal laughter fades out]
So that’s why all these old threads pop-up 
Answer
Top-left white group is unconditionally alive as it has two eyes.
Top-right white group is dead as Black can connect his attacking group to the one below which has two eyes.
Bottom-left white group is alive in seki as if Black approaches at B2, White can capture at A7.
Bottom-right white group is alive in seki as Black cannot approach it without putting his own group in atari. Connecting to his other group does not help as it has only one eye.
For consideration of other players, could you put that in a spoiler, please?
You can find the spoiler tool inside the gear 
submenu on the right of the main one, next to the calendar.
Thanks c:
Done.