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.

2 . 选词填空

1. This sentence doesn’t ________________, so they could hardly understand it.
2. Teenagers who ________________ of high school have trouble finding jobs.
3. How can I ________________ you of her honesty?
4. We greatly ________________ your timely help.
5. He was afraid he ________________ by the company because he was disabled.
6. He raised several questions that excite and ________________ youth.
7. Many medical workers and scientists ________________ further progress in fighting COVID-19 nowadays.
8. He refused to ________________ himself on a controversial issue.
9. The reason why he succeeded ________________ his determination and persistence.
10. Lang Ping has been a volleyball stat for more than 35 years and ________________ the sport of volleyball, which has made her the most popular figure in China’s volleyball history.