请解析英语单句改错（已有答案）为什么这样改？及有关语法句法，谢谢！

Question

1,Like most people ,I was brought up to 【look upon (A)】life as a process of getting .It was 【not until(B)】 in my late thirties 【did I make】 (C)this important discovery: giving away makes life so 【much more(D)】 exciting.
答案： C 改为 that I make
2. Planes are 【the fastest (A)】 way 【to transport (B) 】food. They are especially useful carrying food to people and animals 【that can not(C)】 【be reached (D)】otherwise
答案： C 改为 that could not
3. He got up, walked across the room,【and with (A)】【a(B)】sharp quick movement 【flung (C)】the door【widely (D)】open
答案： D 改为 wide open
4. 【At (A)】 a mini mum, the negotiators are 【hoping to achieve (B)】 an agreement an agreement 【in principle (C)】,【with details worked out (D)】later
答案：D 改为 with details to be worked out
5. 【In note-taking (A)】, a strict discipline has 【to be kept (B)】and all inessential details 【ignored (C)】 and unnecessary words 【eliminated (D)】
答案：B 改为 to be kept to

Answer 1

1.强调句 It is ...that ...
2.otherwise在这里表示一种与事实不符的假设，即“没有飞机”，动词用虚拟语气
3,wide 可以作副词，译为“宽敞地”，修饰具体看得见的事物
widely是“广泛地”，用来修饰抽象的动作，
类似的还有high&highly
4.最后一词later 暗示details 还没有被worked out, 而是将要被worked out, to be done 作后置定语表示将要被做
5. keep A to B把A限制在B里
原句是被动，to不能忘了

Answer 2

第一题：“It was ... that ..." 强调句型。

第二题：that could not be reached otherwise 这是一种虚拟情况，所以用could。

第三题：wide open意思是 "大开着"。widely是“广泛地”。
e.g. English is widely used in the world.

第四题：with details to be worked out 中的不定式to be worked out 表将来，即还未制定出来。

第五题：keep to “保守、保持”之义。keep to discipline 。