However, in response to the 29 of this event, the concepts of fostering peace and harmony do not have to be confined to one day a year.
答案：(A) aim
語意「回應這個活動的『目的/宗旨』」，aim（目的）符合，呼應後文解釋活動的精神理念不局限於一天；tone（語氣）、key（關鍵）、peak（高峰）都不合。
in response to the ______ of this event 這一格四個選項都是短小的名詞，代進去都能唸得下去。key 特別誘人，「回應這個活動的關鍵」聽起來很順；也有人選 tone，覺得「回應…的基調」像是有這種說法。答對率只有 46%，一半以上的人在這裡失手，而鑑別度 60 偏高，代表這一題把讀懂整篇的人和沒讀懂的人分得很開——難的不是單字，是有沒有回頭找第一段。
答案就寫在第一段第二句：The objective is to promote peace all over the world, and to break down barriers between every nationality.（宗旨是促進世界和平、消除各民族之間的隔閡）。objective 就是「目的、宗旨」，而 aim 當名詞時正是 objective 的同義字，兩個字可以互換。空格這一句要回頭指的就是那個宗旨。再看同一句的後半：the concepts of fostering peace and harmony do not have to be confined to one day a year（促進和平與和諧的理念不必侷限於一年一天），這正是把宗旨展開來說。整句的邏輯是：既然這個活動的宗旨是和平，那就不該只做一天。這裡也有一個常見的落差：aim 在你腦中通常只有動詞的「瞄準、以…為目標」，其實它當名詞就是「目的、宗旨」，和 objective、purpose、goal 屬於同一組。
tone：語氣、基調，指的是說話或文章給人的感覺，一個活動本身談不上語氣。key：關鍵，需要交代是「什麼的關鍵」，而文章從頭到尾沒有提到任何關鍵因素。peak：高峰、頂點，它和 peace 只差一個字母，唸起來也接近，很容易看錯；但語意是最高點，文章裡沒有這個概念。peak、peek、peace 這三個字形近音近，考試很愛拿來混淆。
the aim of（…的目的）、achieve one's aim（達成目標）、in response to（回應…、因應…）、be confined to（侷限於…）、foster peace（促進和平）、set a goal（設定目標）。
In the fall of 1973, in an effort to bring attention to the conflict between Egypt and Israel, World Hello Day was born. The objective is to promote peace all over the world, and to 26 barriers between every nationality. Since then, World Hello Day—November 21st of every year— 27 observed by people in 180 countries. Taking part couldn't be 28 . All one has to do is say hello to 10 people on the day.
However, in response to the 29 of this event, the concepts of fostering peace and harmony do not have to be confined to one day a year. We can 30 the spirit going by communicating often and consciously. It is a simple act that anyone can do and it reminds us that communication is more effective than conflict.