一、单词拼写：根据首字母或汉语提示完成句子。（10分,每题1分）
1. You’d better a________ to your teacher for being late.
2. I tried, but I failed to ________ (说服) him to stop smoking.
3. My aunt is good at bargaining and she always buys things at a d______.
4. His a_______ came here millions of years ago in order to make a living.
