In bees and wasps, the front and rear wings are usually hooked together so they look and act as a single unit. It can be hard to tell even after you've seen a bunch of them.
Presence of halteres would make the subjects flies. There's no question if you can see those.
Shape of the antennae is also a good clue. Hoverflies have short bulbous antennae with a sharp bristle near the end. Bees and wasps have elongated thick antennae with no bristles. Compare your bees in this thread with the hoverflies
HERE.
Your first spider looks like a jumper, family
Salticidae. I don't recall hearing of any concern about those. They're kind of fun to play tag with. The other two spiders I can't tell. Only a very few brown/gray spiders are nasty, but caution is warranted because even specialists cannot give a solid ID in most cases. Often only adult specimens can be reliably identified, and those often require microscopic examination of a few hard-to-reach body parts.
--Rik
