I've had to look most of these up, so wait for a second opinion:)
1) zebrać szczękę z podlogi
if you are amazed or in disbelief about something, your jaw drops. If you have to pick it off the floor, then you're really amazed :)
3) which one is correct: help me with or in
help me with
is used more often.
5) ogórek kiszony- according to wikipedia it's a pickle but it's not
According to my dictionary, kiszony is pickle or marinated .