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 . 根据句意，选择单词或短语并以其适当形式填空。

crime     greed     commit     appreciate     optimism     consume     react     expose     dust     urban     terrify     restrict

1. The laws have led to a reduction in fuel ________ in the US.
2. London was hot and________.
3. Her husband faces various ________ charges.
4. I am ________of her kindness.
5. The government has agreed to lift ________ on press freedom.
6. The experts are ________ that we will succeed.
7. ________ would announce that peace was at hand.
8. Many people in China have limited ________to English. That makes it extra hard to learn and practice it.
9. When you express gratitude, you show your love and________.
10. The________boy ate up all the food remaining on the table.
11. This chemical________generates a lot of heat.