题目内容：

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下面划一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者（从第11处起）不计分。

Stockholm, the capital of Sweden, hopes to stop using fossil fuel (化石能源) completely by 2040. Now the city wants larger lorries what cause more pollution to use bio-fuel, which are produced from waste. Stockholm is also working with Fortum, an energy company, to take advantage a city-wide heating system, use waste heat from supermarkets and stadiums to supply heat for homes. However, the city is trying to change people behavior, step by step. On one newly built estate (庄园), people are providing with tablets that show its real-time energy usage. This is to help them good understand how they use and waste gas, water and electricity.