The travel company wanted to 26 people to take January vacations, so they reached out to a psychologist.
答案：(D) encourage
語意「這家旅遊公司想要『鼓勵』人們在一月去度假」，encourage（鼓勵）符合這個行銷目的；increase（增加，不太合直接接people這樣的搭配）、require（要求，語意過強）、command（命令）都不合。
四個動詞的中文都帶點「要人去做某事」的味道，你可能覺得意思差不多。這一題可以分兩關來刪：第一關看句型，第二關看語氣強弱。
第一關——空格後是 people to take January vacations，句型是「動詞＋受詞＋to V」。increase（增加）的受詞是數量或程度，不能接「人＋to V」，先刪掉。第二關——剩下的 require（要求）、command（命令）、encourage（鼓勵）句型都成立，就要看主詞是誰：主詞是 The travel company（旅遊公司），對象是消費者。旅遊公司沒有立場命令或要求顧客，只能鼓勵。 而且後半句 so they reached out to a psychologist（於是他們去找了一位心理學家）說明這是一場行銷操作，行銷的語氣就是 encourage。
increase 句型上就不成立；require 帶有「規定、必須」的意味，通常出自握有權力的一方（學校、法律、雇主）；command 語氣更強，是上對下的命令，用在軍隊或長官。
encourage sb to V（鼓勵某人做……）、require sb to V（要求某人做……）、command sb to V（命令某人做……）、reach out to sb（聯繫、求助於某人）、take a vacation（去度假）、an increase in（……的增加）。
The idea of Blue Monday dates back to a 2005 campaign by Sky Travel. The travel company wanted to 26 people to take January vacations, so they reached out to a psychologist. The scholar then developed an equation to find the most depressing day of the year, and it turned out to be the third Monday in January. Since then, other companies have jumped on the bandwagon to promote everything from soft drinks to new clothes as a 27 . A group in the UK even started a website devoted to "beating Blue Monday."
Many scientists, however, say there is no evidence that Blue Monday causes any more sadness than other specific days of the year. 28 , the idea of Blue Monday persists. According to psychologist Dean Burnett, people feel down in January 29 post-holiday discontent, and the Blue Monday claim makes it seem like there are scientific reasons for this. Also, the idea 30 a very complex issue regarding depression into something simple and easily understandable, and that tends to appeal to a lot of people.