Spyrium

No — placing a worker is a Placement (Phase I) action and does not itself activate the card; you must be in the Activation (Phase II) to activate cards, although you may move to Phase II during Placement and immediately take an Activation action (pages 4–5).

You pay the card's printed price plus £1 for each other worker adjacent to that card (regardless of owner); the chosen worker is then removed from the market and placed inactive by your Start card (page 5).

You pay the card cost (plus £1 per other adjacent worker) and then either place it in a new space (cost £1 per building you already own), replace an existing building for free, or replace a building that shares a symbol to both replace for free and reduce the new building's price by £3 (pages 5–6).

No — when you use a building you incline (turn) it and it cannot be used again that turn; all inclined buildings are straightened at the end of the turn (page 6).

Tokens (values 1–3) are placed on certain market cards face-up; for buildings like Mines/University you discard the token when you construct it and take the indicated resources/points, while for characters a limited number of tokens are placed and you discard a chosen token when calling the character to gain its value/effect (and the Commerce technique can let you keep tokens instead of discarding up to 7) (page 7).

No — you may only take the Pass action if you have no workers left in the market; if you still have workers you must first take Gain money or Activate a card actions (page 6).