After two weeks atop the box office, Thor: The Dark World, released by Disney, slid to second with $14.1 million. After an impressive opening, the romantic comedy The Best Man Holiday" added $12.5 million for a two-week total of $50.4 million. Overseas, the critical and box-office hit Gravity from Warner Bros. ( TWX) opened big in China. The Sandra Bullock space adventure added $46.6 million to its international total in its eighth week of release. Its cumulative haul is up to $577 million.