Since its founding in 1998, Matter of Trust has collected donations of human hair and animal fur to 23 the thousands of oil spills that happen each year.
答案：(B) clean up after
【句型】clean up after 字詞搭配「清理……之後的殘局」，表示「清理每年發生的數千起漏油事件」；get away with（逃脫懲罰）、run out of（用完）、look down upon（看不起）都不合。
clean up 你熟的是「打掃乾淨」，後面直接接被打掃的東西，像 clean up the room（把房間打掃乾淨）。這裡多了一個 after，很多人會卡住：既然要清理漏油，為什麼不是 clean up the oil spills？
clean up after 的意思是「收拾某人或某件事留下來的殘局」（劍橋辭典）。重點在於 after 後面帶出的是「製造髒亂的那個人或那件事」，不是被清掉的髒污本身。你最熟悉的例句就是 Clean up after yourself.（自己弄髒的自己收拾），after 後面接的是弄髒的人。回到這一格：the thousands of oil spills that happen each year（每年發生的數千起漏油事件）是「事件」，事件留下的油污才是被清理的對象，所以 clean up after 完全吻合。
run out of（用完、耗盡）最容易被 oil 這個字誤導——run out of oil 是「油用完了」，但這篇講的是油外洩太多需要清理，不是油不夠用，方向相反。get away with（做了壞事卻沒受到懲罰）的受詞是壞事或謊言。look down upon（看不起、瞧不起）的受詞是人。兩個都跟清理無關。
clean up after（收拾……留下的殘局）、clean up（清理乾淨）、oil spill（漏油、油污外洩）、get away with（做壞事而未受懲罰）、run out of（用完、耗盡）、look down upon／on（看不起）、donations of（……的捐贈）、animal fur（動物毛皮）。
Hair usually gets greasy when it has not been washed because it soaks up oil—hence the need for shampoo! 21 this oil-absorbing feature might not always be so great for our hygiene, it can be great for the environment.
Matter of Trust, a nonprofit organization, has an innovative solution for removing the large-scale oil spill in the Gulf of Mexico in 2010, using the ultimate renewable 22 : human hair, of which there is an unlimited supply. Since its founding in 1998, Matter of Trust has collected donations of human hair and animal fur to 23 the thousands of oil spills that happen each year. The hair and fur are made into mats and brooms and sent to 24 waters to absorb the oil.
Across the United States each day, 300,000 pounds of hair and fur are cut. Matter of Trust is helping organize the collection of this 25 hair and fur through thousands of salons, pet groomers, and ranchers. Individuals can also speak to local hair stylists and pet groomers about sending in leftover hair and fur.