Commas: Missing in action?

In the following sentences, see if you can decide where commas are missing.

1. For goodness' sake don't forget your key!
2. Yes we did have a good time didn't we?
3. Oh I didn't know Jason was here!
4. I'm out of sugar darn! I can't make the cake after all.
5. They're coming to the party are they? Well I'm glad to hear it.
6. Loïc hand me the shovel will you?
7. Tell me Flora how do you like your new home?
8. Excuse me Ma'am you dropped your scarf.