1. I had to decline an invitation to my cousin's wedding because I was abroad.2. He declined a big job offer by a U.S. company because he wants to stay close to his family in Germany.
 decline (politely) refuse politely refuse with courtesydecline 本身就有很有禮貌拒絕別人的意思，但如果你想強調 "禮貌"，後面可加上 politely 之類的副詞。
If you got severely injured and became a vegtable would you want to keep living?