②They claim to provide (provide)the best service in the business.

　　他们宣称他们可以在业务中提供最好的服务。

　　③Doctors claimed to have discovered(discover)a cure for the disease.

　　医生声称已经找到了治疗该疾病的方法。

　　 calm adj.平静的；镇静的　vt.使平静；使镇定 n．平静；无风

　　(教材P52)Mr Li Xiaohe said that he and his family were able to see the monster clearly because the weather was fine and the lake was calm.

　　李小和先生说他和他的家人看清了怪物，因为当时天气好，湖水平静。

　　keep/stay calm 保持镇静

　　calm down (使)平静下来；(使)镇定下来

　　①Whatever may happen，you must keep/stay calm．

　　不论发生什么事，你必须保持冷静。

　　②Moved by what she said，he could hardly calm down．

　　由于被她那些话所感动，他很难平静下来。

　　[明辨异同]　calm/quiet/still/silent

calm 常指天气无风、海面无海浪；心情平静、无忧虑。 quiet 指人时表示生性安静、不易激动；用于环境时指没有干扰活动、没有喧闹声的寂静状态。 still 可以指环境的安静；也可以指姿态保持一动不动。 silent 寂静的，沉默的；不发音的，多指人默不作声。 　　　(calm/ still/ silent/ quiet)

　　③When facing danger，one should keep ；when taken photos，one should keep ；when someone else is asleep，one should keep ；when in class，one shouldn't keep about the teacher's questions.

　　【答案】　calm；still；quiet；silent

　　 unlikely adj.不可能的

(教材P52)They say that the low­temperature lake is unlikely to be able to support such large living creatures.