Why do we have National Parks

Why do we have National Parks why don't we go to one of our national parks to relax 英译汉 why do we have examinatiom why do we have economics models? Why do we have save water? "why do we have to lrarn English"翻译 Why do we have rules and law 英文版答案 why do we have to learn englisg?是什么句子? WHY WE DO NOT HAVE THE RIGHT OF FREE SPEAKING! Do you know why we have Father is day Why do we have to go to school? why do we have to learn Engling?作文