Featuring floral patterns, religious symbols, and messages of hope, the painted henna crowns are amazing substitutes for the hats and wigs that the cancer patients would 19 use to cover their heads.
答案：(D) otherwise
otherwise 在此是「若非如此、本來」：既然現在有 henna 頭冠當替代品，帽子與假髮就是患者「本來會用」的東西。moreover（此外）、altogether（總共、完全）、namely（也就是）語意都不合。
答對率 16%。四個選項都是副詞，文法上誰都塞得進去，只能靠語意判斷，這是它難的原因。
otherwise 你大概只會用在句首的「否則」（Hurry up; otherwise you'll be late.）。這裡它夾在 would 與 use 之間，位置陌生就慌了。其實兩種用法是同一件事：都在講「另一種沒有發生的情況」。
would／might／could ＋ otherwise ＋ 原形動詞 ＝「若不是現在這樣，本來會…」。三個同結構的句子念過就有感覺：kids who might otherwise be out on the streets（若沒有這些榜樣，這些孩子本來會流落街頭）／opportunities they would never otherwise have had（若沒有這計畫，本來絕不會有的機會）／problems that might otherwise go unnoticed（若沒有檢測，本來不會被發現的問題）。
句中的 substitutes for（…的替代品）是觸發點：既然頭冠是替代品，帽子與假髮就是「本來會用」的東西；would 也在配合這個假設。
Hurry up, or you'll be late. 的 or ＝ or else ＝ otherwise，三者同一件事，難的是位置不是意思。
moreover（此外）是補充、namely（也就是）是舉例、altogether（總共）是總計，都表達不出「若非如此」。
…; otherwise…（否則）、would otherwise + 原形（本來會…）、an otherwise + 形容詞 + 名詞（若非如此本來…的）、unless otherwise stated（除非另有說明）。
The art and tradition of using all-natural paste from the henna plant to create temporary henna tattoos goes back to ancient Asia and the Middle East. Over the centuries, henna tattoos 16 used in weddings and holiday celebrations because they are thought to carry blessings from the gods.
Today, the ancient art form has found a new 17 in the hands of contemporary artists. Henna Heals, an artist group based in Canada, uses henna tattoos to help women suffering from cancer feel confident and beautiful again. They draw elegant henna crowns on the women's bare heads to help them 18 the loss of their hair after cancer treatment.
Featuring floral patterns, religious symbols, and messages of hope, the painted henna crowns are amazing substitutes for the hats and wigs that the cancer patients would 19 use to cover their heads. Many women report that the henna crowns really work as a healing device, helping them build a more 20 self-image at a time when they are vulnerable and depressed. According to Frances Darwin, founder of Henna Heals, the number of artists now involved in the project across Canada and the US has grown to over 150.