It is believed that taking breaks from a problem can help 17 a moment of insight or stimulate new ideas.
答案：(A) spark
spark 固定用法「激發」，表示「暫時放下問題休息可以幫助激發靈感的瞬間」；carve（雕刻）、drill（鑽）、grind（研磨）都不合。
spark 你最熟的是名詞「火花」，動詞「引發、激發」的用法比較陌生，所以四個選項讀起來會覺得都很怪。
先確認空格的位置：help 後面可以直接接原形動詞（help 也可以接 to V，兩種都對），所以空格是一個原形動詞，受詞是 a moment of insight（靈光乍現的一刻）。真正的線索在 or 的後面：or stimulate new ideas（或激發新的想法）。or 連接兩個並列的動詞，兩邊的語意方向必須一致，stimulate 是「激發」，所以空格也要是同方向的「引發」。spark 當名詞是火花，火花點燃東西，這個字面意象可以直接幫你記住動詞的意思：spark 就是「點燃、引爆某件事」。
carve（雕刻）的受詞是木頭、石頭、雕像這類具體的材料。drill（鑽孔；操練）是往下鑽。grind（磨碎、碾磨）是磨成粉。三個都是對具體物體施力加工的動作，不能接 a moment of insight 這種抽象名詞。
spark（引發、激發）、spark interest（引起興趣）、spark a debate（引發辯論）、spark controversy（引發爭議）、stimulate（刺激、激發）、a moment of insight（靈光乍現的一刻）、take a break from（暫時放下……休息一下）、help + 原形動詞（幫助……）、carve（雕刻）、drill（鑽孔；操練）、grind（磨碎）。
It has long been assumed that creativity is some unusual trait enjoyed by the few. However, according to a wide array of scientific and sociological research, creativity is 16 a sign of rare genius than a natural human potential. Thus, it can be nurtured and encouraged.
It is believed that taking breaks from a problem can help 17 a moment of insight or stimulate new ideas. Unconventional solutions can also be explored. That is why some of the most successful companies in the world, such as 3M and Google, encourage their employees to 18 all sorts of relaxing activities, such as playing pinball and wandering about the campus. During such breaks, the mind turns inward, 19 it can subconsciously puzzle over subtle meanings and connections.
Another way to increase creativity is to take risks. This is because many breakthroughs come up when people venture 20 their usual routines or areas of expertise. This can be done by, for example, learning new skills or traveling to new countries.