2018年6月英语四级（第1套 · 含听力）选词填空

An office tower on Miller Street in Manchester is completely covered in solar panels. They are used to create some of the energy used by the insurance company inside. When the tower was first __26__ in 1962, it was covered with thin square stones. These small square stones became a problem for the building and continued to fall off the face for 40 years until a major renovation was __27__. During this renovation the building's owners, CIS, __28__ the solar panel company, Solar century. They agreed to cover the entire building in solar panels. In 2004, the completed CIS tower became Europe's largest __29__ of vertical solar panels. A vertical solar project on such a large __30__ has never been repeated since.
Covering a skyscraper with solar panels had never been done before, and the CIS tower was chosen as one of the "10 best green energy projects". For a long time after this renovation project, it was the tallest building in the United Kingdom, but it was __31__ overtaken by the Mill bank Tower.
Green buildings like this aren't __32__ cost-efficient for the investor, but it does produce much less pollution than that caused by energy __33__ through fossil fuels. As solar panels get __34__, the world is likely to see more skyscrapers covered in solar panels, collecting energy much like trees do. Imagine a world where building the tallest skyscraper wasn't a race of __35__, but rather one to collect the most solar energy.