從已知求未知，是綜合填空的解題思路。
一、 空格句子和前後句之間，呈現出這樣的基本關係：
1. 事實一（需關注：名、動、形、副詞）
2. 銜接詞（純連詞、連接性副詞及詞組——非必要條件）
3. 事實二（需關注：名、動、形、副詞）
二、 相鄰兩句（事實）之間的關係，可以總結為五類、十種：
總分關係
舉例——such as; including; for example; To illustrate; etc.
總結——in a word; in short; in conclusion; to sum up; etc.
並列關係
平行——in addition; as well; also; moreover; besides; etc.
遞進——in fact; particularly; still; even; what’s more; etc.
對比關係
對比——by contrast; in comparison; on the other hand; etc.
轉折——in practice; however; instead; despite; while; even so; etc.
因果關係
因果——therefore; hence; thus;; for this reason; etc.
條件——as a result; in this way; accordingly; etc.
時空關係
時間——at first; at the same time; all the time; finally; etc.
空間——beyond; below; ahead; nearby; on the left; etc.
三、 求解範圍基本是“知二求一”，即文中找到兩個條件，推理出一個未知的。
1、求事實一。例如：
But have you ever heard of a forest fire that can be ____86____ for a forest? People start some of the fires with a special reason to actually do good to the eco-system.
86. A）helpful B）powerful C）harmful D）awful
已知事實二：fires；do good (to the eco-system)
句際關係為：總分——（舉例）有些森林大火有利生態
推導事實一：helpful——森林大火也可以有幫助
（注：大部分情況是在前一個事實句中挖空。）
2、求事實二。例如：
Sometimes you may not understand your parents. One minute they’re friendly, the next minute they’re shouting and screaming loudly enough for the whole street to hear. So who makes them so __85__? You, probably!
85. A. friendly B. lonely C. changeable D. comfortable
已知事實一：One minute；friendly。the next minute；shouting and screaming loudly
句際關係為：概括——（舉例）時而和藹時而尖叫
推導事實二：什麼讓他們如此changeable（多變的）
3、求銜接詞。例如：
Can you imagine how boring this (cooking meals) can get? Imagine how your parents feel when you say you’re not really hungry. __90__, your parents are probably worried that you aren’t eating enough.
90. A. In addition B. In return C. At most D. At last
已知事實一：imagine how they feel （他們的感受——失望）
已知事實二：parents are probably worried（他們怕你吃不飽——擔心）
句際關係為：並列——一方面失望或生氣、同時又（in addition）擔心
4、需要注意：大部分情況下，要藉助多處事實。例如：
You may hate missing a party to visit some boring old relatives. They may go on and on about what a sweet baby you were. You have no choice but to listen. Even if you __88__, your parents won’t change their minds.
88. A. agree B. complain C. listen D. win
已知事實一：包括關鍵詞(you) missing a party; (act) a sweet baby; (have) to listen；以及(parents) won’t change their minds
句際關係為：讓步，even if（即使）
推導事實二：complain（你忍耐著一切，即便你抱怨也無濟於事）
Every lie requires five more lies. If you keep hiding truth from them, they will not __78__ you. They will not respect you.
78. A. trouble B. remember C. answer D. trust
已知事實一：If you keep hiding truth和they will not respect you
句際關係為：並列——not respect + not ______?
推導事實二：respect（一個謊言導致更多謊言去掩蓋；如果你這麼做了，他們會不尊重、不信任你。）
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