1 . 用方框中词或词组的适当形式完成下列句子，每个词或词组只能用一次(每组有一个多余的选项)。

appreciate   commit   convince   ambitious   drop out   turn one’s back on

1. You need to __________ them of your enthusiasm for the job.
2. The club gets small as members move away or __________.
3. He was deeply __________ of your kindness.
4. She __________ them when they needed her.
5. Last year, both sides __________ themselves to settling the disagreement peacefully.