2.... because it's the key to successful rescues. 因为这是成功救援的关键。
【感知】(1) Working hard is the key to success. 努力工作是成功的关键。
(2) Regular practice is the key to making progress. 持之以恒的练习是取得进步的关键。
【思考】通过观察可知，be the key to 意为“”，该结构中的 to 为词，故而 be the key to 后跟词或词。
【运用】
(1) Listening carefully to the teacher is the key to (learn).
(2) Farmers often water vegetables because it's the key to (grow) them.
【拓展】

【运用】请用 succeed、success、successful 或 successfully 填空。
Tom wanted to in the maths test. He thought hard and practiced a lot. Finally, he got great . His parents said he was a boy because he finished the test .

思考：是……的关键；介；名；动名
运用：(1) learning (2) growing
拓展运用：succeed；success；successful；successfully

3. But our primary goal has always been to save as many people as we can. 但是我们主要的目标一直是尽可能多地救人。
【感知】(1) You should try to remember as many words as you can. 你应该尽可能多地记单词。
(2) Please save as much water as possible. 请尽可能地节约用水。
(3) Teng Fei tried to run as fast as he could. 滕飞尽全力快速奔跑。
(4) Peter wanted to make his room as tidy as possible. 皮特想把自己的房间收拾得尽可能整洁。
【思考】通过观察可知，“as... as sb can/could”意为“”，与“as... as possible”拥有同样的含义，中间可填入形容词或副词的级，或者可填入“many/much + 词”。
【运用】
(1) Please speak as (clear) as possible to make everybody understand you.
(2) I have learnt as many skills as I can. (英译汉)

(3) 今年我想尽可能多读些书。(汉译英)

思考：尽某人所能/尽可能；原；名
运用：(1) clearly (2) 我已经尽可能多地学习了技能。 (3) This year, I want to read as many books as I can. /This year, I want to read as many books as possible.

4. We were so thankful that they found us! 我们很感激他们找到了我们!
【感知】(1) English is so interesting that I love it very much. 英语非常有趣，我很喜欢。
(2) He ran so fast that no one could catch him. 他跑得飞快，没人能追得上。
(3) Mike has learnt many life - saving skills so that he could save more people successfully. 麦克学习了很多救生技能，就是为了能成功救人。
(4) Amy saves her pocket money so that she can donate it to help the kids in need. 艾米攒零花钱，就是为了捐钱帮助有需要的孩子。
【思考】通过对比观察(1)(2)和(3)(4)可知，“so... that”意为“”，引导状语从句，中间需填入词或词；而 so that 意为“”，引导状语从句。
【运用】
(1) 选择括号内的恰当单词填入空格。
① The Ugly Duckling is so (meaningful/meaningfully) that I've read it for several times.
② I finished my work so (quick/quickly) that I was the first to get off work.
(2) 英汉互译。
① Cindy was so young that she couldn't go to school.

② Tom held his sister's hands so that she could keep warm.

③ 我太开心了，以至于我上错了公交车。

④ 我的姐姐一直努力学习，这样她就能取得进步。

思考：如此……以至于；结果；形容；副；这样就；目的
运用：(1) ① meaningful ② quickly
(2) ① 辛迪太小了，还不能上学。
② 汤姆握住他妹妹的手，这样她就能保持暖和。
③ I was so happy that I got on the wrong bus.
④ My sister kept studying hard so that she could make progress.