The place _______ interested me most wasthe Gnat Wall．

pace, the earth looks blue. This is about seventy-one percent of its surface is covered by water.

(2013·亳州模拟)　　　difficult and challenging the task may be, we must finish it on time, because there is a possibility　　　we’ll be fired if we can’t fulfill the task on time

Food safety is important. Rules _____ to stop people from food pollution.

下列句中的成语，使用恰当的一项是（ ）