3 Gate Questions

By Unspeakable, in Arkham Horror Second Edition

I just started playing Arkham Horror and am loving it. 3 questions game up during game play that I've been unable to find answers for.

1. Can a clue token be placed on a location with an open gate?

2. When an investigator moves onto a location with an open gate that also has a monster on it does he fight that monster before entering the other world or after he returns from the other world?

3. When a second gate appears on a location that already has a gate does the first gate remain or is it replaced?

ahh, if we only had an ongoing FAQ…maybe, I'll simply create a page on AH Wiki for the most common questions. As to these…

1.) No clue may appear on a location with an open gate.

2.) If the monster is already present on the gate, you fight it (or evade it) during Phase 2. Movement and then enter the gate during Phase 3. Arkham Encounter

3.) If you're simply playing the basic game, consider yourself lucky ~ no Doom Token is added this turn and no monster appears at the gate

Addendum to 3, even though it's probably unnecessary: there is a monster surge, which does mean that a monster appears at the gate (and elsewhere).

Thanks to both of you. Greatly appreciated.