It allows children to 23 their shoes’ size as their feet grow.
答案：(A) adjust
語意「它讓孩子能夠隨著腳長大『調整』鞋子尺寸」，adjust（調整）符合這個創新鞋子的功能描述；explore（探索）、insert（插入）、overlook（忽視）都不合。
adjust 你背過的多半是「適應」，像 adjust to a new environment（適應新環境），所以看到要填「調整尺寸」時反而不敢選。其實 adjust 有兩種用法，差別只在有沒有 to：adjust 後面直接接受詞是「調整」（adjust the size 調整尺寸），adjust to 後面接名詞才是「適應」（adjust to the change 適應這個改變）。
線索在同一句和前後文。這雙鞋叫 The Shoe That Grows（會長大的鞋），空格後面是 their shoes' size as their feet grow（隨著腳長大，鞋子的尺寸……）。腳在長，鞋子尺寸要跟著改變，所以填「調整」。再往後看兩句還有 can expand in three places（可以在三個地方撐開）、control the length（控制長度）、allow for different widths（容許不同寬度），整段都在講同一件事，方向非常一致。
explore（探索、探究）後面接的是未知的領域或問題，像 explore new markets（開發新市場）。insert（插入、放入）是把東西塞進另一個東西裡，尺寸不能被「插入」。overlook（忽視；也可指「俯瞰」）語意相反，這雙鞋的重點正是不讓尺寸問題被忽略。
adjust the size（調整尺寸）、adjust to（適應）、make an adjustment（做出調整）、adjustable（可調整的）、explore（探索、探究）、insert（插入）、overlook（忽視；俯瞰）、grow out of（長大而穿不下）。
Shoes are hugely important for protecting our feet, especially in places like Africa, where healthcare provision is limited. Unfortunately, shoes are not always readily available for people living in poverty, 21 shoes that are the right size. Almost as soon as a child receives shoes to wear, he/she is likely to have grown out of them. Then the child has to 22 with shoes that are too small.
The Shoe That Grows, created by a charity called Because International, changes all this. It allows children to 23 their shoes' size as their feet grow. The innovative footwear resembles a common sandal and is made of leather straps and rubber soles, a material similar to that used in tires. They come 24 two sizes, and can expand in three places. The straps on the heel and toe control the length of the shoe, 25 the two on either side allow for different widths. With this special design, the shoes can "grow" up to five sizes and last for at least five years.