19 suggestion made by the experts is to dip newspaper sheets in vinegar and water, and use them to clean windows, mirrors, and tiles.
答案：(B) Another
Another suggestion（另一個建議）承接前文已提過的第一個建議（把報紙變成木炭），引出第二個建議，符合列點論述的邏輯。This／That 是指示前文剛提過的同一件事，不是「另一個」，Other 不能直接修飾單數名詞 suggestion。
四個選項都是指示或限定的字，中文都能說成「這個、那個、另一個」，你會憑語感挑一個。
這是指標勾環，線索一定要跨句才看得到。前面已經給過一項建議：把舊報紙做成木炭。空格這一句 ______ suggestion made by the experts is to dip newspaper sheets in vinegar and water（專家提出的______建議是把報紙浸在醋水裡）講的是第二項，與前面那一項並列。要說「除了前面那個之外，另一個」，用 Another。填進去讀成 Another suggestion made by the experts is to dip newspaper sheets in vinegar and water。還有一個形態上的印證：Another 本身就是 an 加 other，所以後面一定接單數可數名詞，而 suggestion 正是單數。
This 與 That 是回頭指前面已經提過的那一個，但這一句要講的是新的一項，不是同一項；Other 後面要接複數名詞（other suggestions）或不可數名詞，接不上單數的 suggestion，形態上就先出局——這一招比慢慢想語意快。
another ＋ 單數可數名詞（另一個）、other ＋ 複數名詞（其他的）、the other（兩者中的另一個）、others（其他人、其他東西）、an option other than（除……以外的選擇）、dip A in B（把 A 浸在 B 裡）。
If old newspapers are stacking up in your house, there are options other than tossing them out or selling them to a recycler.
Some environmental scientists suggest turning newspapers 16 charcoal. This can be done by soaking sheets of newspaper in water for two hours and then 17 them into small pieces. These pieces are then compressed into balls. After the water is 18, the ball-shaped pieces are put under the sun to dry before they can be used as a firewood or charcoal substitute.
19 suggestion made by the experts is to dip newspaper sheets in vinegar and water, and use them to clean windows, mirrors, and tiles. Old papers can 20 be used to line rubbish bins and as packing material when mailing breakable goods.