(lc)which sentence below shows correct use of em dashes?

before his european travel highlight of his summer, mickey forced-himself to pay-off his credit cards.

before his highlight of his summer european travel – mickey forced himself to pay off his credit cards.

before his european travel, the highlight of his summer mickey – forced himself to – pay off his credit-cards.

before his european travel – the highlight of his summer – mickey forced himself to pay off his credit cards.