In places like India, the peacock is considered lucky because the great many “eyes” on its feathers are said to alert it to 23 evil.
答案：(B) approaching
alert sb to sth 的 to 是介系詞，後面須接名詞，故空格要填修飾 evil 的現在分詞 approaching（逼近的）；approach 與 be approaching 都是動詞形式，approached 為被動意味，均不合。
看到空格前面的 to，你大概會直覺接原形動詞，於是選 approach。這個 to 不是不定詞，是 alert sb to sth（提醒某人注意某事）本身帶的介系詞。
判斷的依據在空格前後兩側：前面是 alert it to 的 to，後面是名詞 evil。alert sb to sth 的 to 是介系詞，其後須接名詞；而該名詞 evil 已經印在空格後面，可知空格要填的是修飾 evil 的字，也就是現在分詞 approaching（正在逼近的），全句意為「羽毛上眾多眼睛狀的花紋據說能提醒牠留意逼近的邪惡」。凡是空格前有 to 的題目，判斷步驟相同：先看 to 前面那個動詞慣用什麼搭配，若該動詞本身要求接 to，那個 to 就是介系詞，其後接名詞或動名詞。
approach 是原形動詞，介系詞 to 後面不接原形。be approaching 同樣是動詞形式，不能放在介系詞之後，且該子句已有動詞 are said。approached 為過去分詞，表示被動或動作已完成，而 evil 是逼近的一方，語意不合。
alert sb to sth（提醒某人注意某事）、look forward to + V-ing（期待）、be used to + V-ing（習慣於）、object to + V-ing（反對）、an approaching storm（逼近的暴風雨）。其中 be used to + V-ing 這一組考過 4 個年度，83 年第 15 題 →、99 年第 16 題 →、105 年第 21 題 →都出現過。
Much like the dove and robin, the bluebird is considered a very lucky sign in most cultures, particularly when seen in the spring. 21 , a woodpecker, when seen near the home, is regarded as a good sign. In contrast, the peacock is not 22 seen as lucky. In places like India, the peacock is considered lucky because the great many "eyes" on its feathers are said to alert it to 23 evil. Peacocks are also highly valued in China and Japan, where they are kept as symbols by the ruling families to 24 their status and wealth.
However, the peacock receives only scorn from the rest of the world. The feathers of peacocks are considered the most 25 part of the bird because the eye-shaped markings on them are associated with "evil eyes." To bring the evil eye into the home is thus believed to invite trouble and sorrow.