dead, death, died; has increased

dead, death, died; has increased, increases, increased The nation’s highway _________toll ________every year since the invention of the automobile.
【正确答案】：death, has increased
【题目解析】：第一个空格的含义是死亡总数，用名词death修饰toll，dead指的是死的，用来修饰人或者生物。第二个空格是谓语，根据since引导的时间状语，谓语用现在完成时。