You might speed up healing time by gently pressing a warm washcloth 20 your eyelid for 10 minutes, 3 or 4 times a day.
答案：(A) against
press A against B 是「把 A 壓在、抵在 B 上」，本句指把溫熱的毛巾輕壓在眼皮上；among（在…之中）、about（關於）、after（在…之後）都不合。
against 你大概只記得「反對」（be against the plan、fight against），沒學到它更基本的空間意義：兩個物體接觸並互相抵住。這個核心概念同時解釋了兩種用法——實體的「抵住」（lean against the wall 靠著牆）與抽象的「對抗、反對」，都是「頂著、相向」的意思。
介系詞的空格，先確認空格前後各是什麼、兩者之間發生什麼動作。本句為 gently pressing a warm washcloth {20} your eyelid for 10 minutes（以溫熱的毛巾輕壓眼皮十分鐘）：毛巾與眼皮是兩個相互接觸的物體，動作是 press（施加壓力），所需的正是「貼合並施力」這一層關係，press A against B 為固定說法。作答線索在下一句：Make sure you don't squeeze or pop a stye like you would a pimple.（切勿如同擠痘痘一般去擠壓針眼），同樣談施力，一輕一重前後對照，可知前一句要表達的是輕壓於其上。against 的這個意思在 lean against the wall（靠牆）、rain beating against the window（雨打在窗上）等常見說法裡都看得到，皆非「反對」，而是「抵著、打在…上」。凡是考介系詞的空格，判斷步驟相同：先確認空格前後兩個事物之間是接觸、包圍還是分離，再選出對應的介系詞。
among 用於三者以上之間（among the trees）；about 意為「關於、大約」；after 意為「在…之後」，三者均無法描述貼合並施力的動作。
press A against B（把 A 壓在 B 上）、lean against（靠著）、up against（面臨）、be against（反對）、against the law（違法）、against one's will（違背意願）。
You begin to notice a bit of pain on your eyelid each time you blink. You 16 the mirror to find a tiny red spot on the base of your lower lashes. These 17 are probably the beginning of an eye stye. An eye stye is a small bump, resembling a pimple, that develops when an oil gland at the edge of an eyelid becomes infected by bacteria. These bacteria are found in the nose and are easily 18 to the eye when you rub your nose, then your eye. Pus will build up in the center of the stye, causing a yellowish spot. Usually a stye is accompanied by a swollen eye.
19 a stye can look unpleasant at times, it is usually harmless and doesn't cause vision problems. Most styes heal on their own within a few days. You might speed up healing time by gently pressing a warm washcloth 20 your eyelid for 10 minutes, 3 or 4 times a day. Make sure you don't squeeze or pop a stye like you would a pimple. Doing so may cause a severe eye infection.