28 of us can be perfectly sure about how things will turn out in the future. But we can, and often do, think of the possibilities.
答案：(D) None
None of us can be perfectly sure（我們沒有人能完全確定）呼應後句「但」我們可以、也經常會去思考各種可能性，前後形成「無法確定／但仍會臆測」的對比。All／Some／Many 都無法帶出這種與後句 But 銜接的語意對比。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
四個選項都能接 of us，文法上一個也刷不掉，只能比語意；而「我們有些人／很多人無法完全確定未來」聽起來也很合理，Some 與 Many 就這樣被選走。這一題的線索不在空格所在的這一句，在下一句的第一個字。
先把下一句讀完：But we can, and often do, think of the possibilities.（但我們可以、而且經常會去思考各種可能性。）開頭是 But，But 要求前後相反。既然後面是肯定的「我們可以思考可能性」，前面那一句就必須是否定的——四個選項裡只有 None 是否定的，填進去讀成 None of us can be perfectly sure about how things will turn out in the future.（我們沒有人能完全確定未來會怎麼發展。）前後就成了「沒有人能確定，但我們仍然會去想」，這才是這一段要說的話。這一格是「先讀連接詞再回頭填空」的典型：空格所在的句子自己是中立的，正負要由下一句的 But 決定。順帶記一個同句裡的用法：we can, and often do, think of... 的 do 是替代，代替後面的 think of the possibilities，避免重複；國中的 Do you like it? — Yes, I do. 就是同一招。
All of us can be perfectly sure（我們全都能完全確定）填進去，後面的 But 就沒有東西可以轉折了，而且與整篇「機率是用來讓猜測更準確」的主旨相反；Some 與 Many 都是「有一部分人能確定」，同樣接不上 But——如果真有人能確定，後面就不必說「但我們可以去思考可能性」了。三個選項的共同破綻是：它們都讓下一句的 But 失去作用。
none of us（我們沒有人……）、turn out（結果變成、演變成）、be sure about（對……有把握）、think of（想到、思考）、do 的替代用法（代替前面出現過的動作，國中掛鉤 Do you like it? — Yes, I do.）、possibility（可能性）
Which would you wear to a football game, a sweater or a raincoat? 26 the raincoat if you thought there was a good chance of rain. Which basketball team is more likely to win, one that is 30 points ahead at the half or its opponent? Teams have been known to come from 27 to win, but the chances of overcoming that kind of lead are slim.
28 of us can be perfectly sure about how things will turn out in the future. But we can, and often do, think of the possibilities. We can try to guess 29 this or that might happen.
In some cases mathematics can help make these guesses more accurate. The branch of mathematics that helps make our guesses more accurate is called probability. Probability is the science of 30. It is among the fastest growing and most useful parts of today's mathematics.