重點講解：
1. be sure to do sth.
（事情的發生）一定，必然；
eg. Our product is sure to win out over those of our competitors.
我們的產品肯定會優于我們對手的產品。
eg. You're sure to be blown up for coming late to work.
你一定會因為上班遲到被責罵。
2. change one's mind
（使）改變主意；（使）改變決定；
eg. It would be impossible to change his mind.
要讓他改變想法是不可能的事情。
eg. She's very young. She might change her mind about what she wants to do.
她很年輕，對于自己想要做的事情也許會改變主意。
3. in search of
尋找；尋求；
eg. Migratory workers migrate to cities in search of work.
流動工人移往城市找尋工作。
eg. The scientists are in search of a new element.
科學家們正在尋找一種新元素。
4. hurry to do sth.
趕緊（做）；急忙（做）；匆忙（做）；
eg. Mrs Hardie hurried to make up for her tactlessness by asking her guest about his holiday.
哈迪夫人趕緊問客人假期過得怎么樣，替自己的言不得體打圓場。
eg. They started a few minutes ago, and we must hurry to catch up.
他們幾分鐘前已出發，我們必須趕緊追上。
5. on duty
上班；值班；
eg. There were 2,250 policemen on duty in and around the stadium.
在體育場內及周邊有 2，250 名警察在值勤。
eg. Extra staff had been put on duty.
編外人員已經就職。