He began to take political science __________ only when he left school.

id you make it at last —-Yes. But for your help, it _____ a serious loss.

下列句子中，划线的传统礼貌称谓使用正确的一句是

With food, water and electricity ______,the villagers are suffering a lot.

How time flies ! Several years _____ since we last metat Jack’s Party.