1．One hundred dollars a month is not a fortune __but__ would help cover my living expenses.
解析 句意：一个月100美元不是一笔巨款，但是能够帮助我支付生活费用。
2．It is hoped that you can make some adjustments about the quality of your service __in__ response to the reactions of the customers.
解析 in response to为固定搭配，意为“作为(对……的)响应”。句意：作为对顾客反映的响应，希望你们能对你们的服务做出一些调整。
3．Nobody can __casually__(casual) succeed. Success comes from the thorough selfmanagement and willpower. Behind others' success, there must be much hard work which we've never experienced.
解析 句意：谁也不能随随便便成功，成功来自于彻底的自我管理和毅力。别人成功的背后肯定付出了我们从没有经历过的艰辛努力。
