探究点 cost 的用法
The cost of the trip to Sanya was 5,500 yuan in all.
去三亚旅行的总费用是 5500 元。
This mobile phone cost me 3,000 yuan.
这部手机花费了我 3000 元。

[知识拓展]
辨析 pay, spend, take 与 cost

We can pay for things on our mobile phones.
我们可以在手机上付款。
I usually spend an hour (in) reading English every morning.
我通常每天早晨花一个小时读英语。
It takes about eight minutes for light to travel from the sun to the earth.
光从太阳到地球大约需要 8 分钟的时间。
The dictionary I bought yesterday cost me 20 yuan.
我昨天买的字典花了我 20 元。
情境应用
1. —Wow, your sweater is very beautiful! How much is it?
—Thank you. It ______ me 30 dollars.
A. spent
B. paid
C. cost
D. took
2. I spent half an hour ______ my homework last night. (finish)
3. Li Hua ______ ¥50 for the schoolbag yesterday. (pay)
4. It ______ us an hour to go to my hometown by train. (take)

【解析】：
1. 根据题意，回答中需要表达的是毛衣花费了30美元。"cost" 的主语是物，符合题意，故选择 C。
2. "spent" 后接动词的-ing形式，表示花费时间做某事，所以选择 "finishing"。
3. 根据题意，需要表达李华为书包支付了50元。"pay" 的过去式是 "paid"，与 "for" 搭配使用。
4. 根据题意，需要表达乘火车去家乡花费了我们一个小时。"take" 的第三人称单数过去式是 "took"。
【答案】：
1. C
2. finishing
3. paid
4. took

Ⅰ. 根据句意,用括号中所给词的适当形式填空
1. I hope that you can get good grades. (sincere)
2. The story in this book is very interesting. (open)
3. The wishes in this letter are very warm. (close)
4. The between them was resolved (解开) through an honest conversation. (understand)
5. Simon has difficulties to this question. Let’s give him more time to think about it. (reply)

1. sincerely
2. opening
3. closing
4. misunderstanding
5. replying

1. 句意为我真诚地希望你能取得好成绩，这里要用副词“sincerely 真诚地”来修饰动词“hope 希望”。
2. 句意为这本书的开头故事很有趣，“opening story”表示开头的故事，要用名词“opening 开放、开头”。
3. 句意为这封信中最后的祝福很温暖，要用“closing 最后的”作定语修饰“wishes 祝福、祝愿”。
4. 句意为他们之间的误解通过一次坦诚的对话解开了，要用“misunderstanding 误解”作主语。
5. “have difficulties (in) doing sth”是固定搭配，表示做某事有困难，所以这里要用“replying”，句意为西蒙回答这个问题有困难，我们多给他点时间想想。