They are all organized with a simple intention---to 21 global understanding and mutual appreciation among young scientists in all countries.
答案：(B) promote
promote（促進）符合「促進全球理解與相互欣賞」的語意；sponsor（贊助）、determine（決定）、calculate（計算）皆不符合此處語境。
四個選項是四個不同的動詞，文法上都放得進 to 後面的原形位置，可見這一格考的是語意，只能往搭配上找。答對率四成五。
先看空格後面接的是什麼：global understanding and mutual appreciation（全球性的理解與相互欣賞）。這兩個都是抽象的、可以「往上推動」的東西，能與它們搭配的動詞是 promote（促進、增進）：promote global understanding 是常考的字詞搭配，同一組的還有 promote peace、promote cooperation。破折號在這裡不是句界，它引出的是前面 a simple intention（一個單純的目的）的內容，所以整句自己就選得出答案。
sponsor（贊助）：出錢支持一項活動或一個人，受詞通常是比賽、節目、選手，不能贊助一個「理解」。determine（決定、查明）：把某件事定下來或查清楚，understanding 不是可以被決定的東西。calculate（計算）：拿來算數字的，接不了抽象名詞。三個的方向都不對，只有 promote 站得住。
promote understanding（增進理解）、promote cooperation（促進合作）、mutual appreciation（相互欣賞）、with the intention of（抱著……的意圖）、sponsor an event（贊助一項活動）、determine the cause（查明原因）。
There are six international science Olympiads in the world. They are all organized with a simple intention—to 21 global understanding and mutual appreciation among young scientists in all countries. Each of the six science Olympiads 22 its specific aims.
The aims of the International Mathematical Olympiad (IMO), for example, are three-fold. With arduous but interesting math problems, the first aim of the IMO is to discover, to encourage and, most important of all, to challenge 23 gifted young people all over the world. Secondly, it is by participating in any IMO contest that young mathematicians of all countries can foster friendly 24.
Based upon its second aim, more international exchanges are encouraged and established. Any IMO contest brings not only young mathematicians together but also their instructors; 25, the IMO has its final aim to create opportunities for the exchange of information on math schedules and practice throughout the world.