填以下括号 答案必须是a,an,the这三个中选择

填以下括号 答案必须是a,an,the这三个中选择
On ( ) first trip,Columbus and his crew set sail from Spain and spotted ( ) Caribbean Islands.Later,they lande on ( ) island which Columbus named San Salvador.Columbus thought he had made it to Asia,and called this area ( ) Indies,and its inhabitants Indians.