Some other snails taken in August Lantau Island. I have no idea what are they. Please help me to ID!

No.1 I took this in the forest not the sea shore. It really looks Achatina fulica for me.



No.2 Taken in tidal flat.



No.3 Taken in tidal flat. I think they are Monodonta labio. (Does M. confusa exist in HK?)



No.4 Taken in tidal flat.



No.5 Taken in estuary area. There are also found some of Onchidiidae in the same place.



Thank you!