选B.cost 花费（金钱）
sth costs sb some money 某物花费某人多少钱
spend和pay的主语是人,排除AC
take是花费时间.排除D
无锡之行将花费每个人大约500元.Sugar is very important to all the people living ____ this island .A.on B.in C. for D.with选A。 on the island 在岛上。