Why should a housekeeper never put the letter M in her refrigerator?是什么意思

Why should that be?why . If love is just passing through,why should a why should you never tell secrets in a cornfield Why should we marry? WHY SHOULD I CARE why should Icare.. Why should be? why should he? Why should I be 英语作文：Should animals be kept in a zoo?Why or why not? Should children drink wine?Why?Why not? Why should I learn English why should i learn english why should we do exercise? Why should study Business English Why should people plant trees? Why should we hire you? We should speak English as____as possible.A.much B.many C.more D.most why?thanks