1.How many competitors from how many countries________?从多少个国家来的多少名运动员参加了比赛?

竞争/竞赛（vi.） . 竞赛（n.） , 参赛者（n.） , compete in (a game, a match)参加,在…方面竞争 compete with/against sb和某人竞争 compete for( a prize, a medal, …)角逐,为…竞争

competed

compete.

competition

competitor