Artwork gets dirty. Art that has been around for centuries gets even dirtier. If any art is cleaned too often or ith harmful materials, it can be ruinedby someone in an instant. In Italy, some scientists were _(1)_ cleaning statues by Michelangelo at the Medici Chapels. They knew that just using soap and water wasn’t going to work because there were layersof dirt on them. So, what did they do? They made microbes _(2)_ the dirty work.
Michelangelo’s marble sculptureshave been stainedsince the 16th century. Experts couldn’t use a common cleaner because it would easily destroy details of the marble sculptures. _(3)_, scientists developed a substance with bacteria that could eat away the grimewithout damaging the marble. The scientists tested several kinds of bacteria on small pieces of marble before finding the one that worked best. In the end, the substance proved to be very _(4)_. It is now considered the best way to get such statues looking new again.
After the special _(5)_, the statues began to glow again and visitors were impressed. While the works will never look exactly the same as they did 500 years ago when they were brand-new, at least they now look much better.
1. (A) tired of (B) tasked with (C) arrested for (D) applied to
2. (A) done (B) to do (C) did (D) do
3. (A) Traditionally (B) Equally (C) Luckily (D) Unfortunately
4. (A) effective (B) doubtful (C) independent (D) religious
5. (A) patience (B) treatment (C) discount (D) moisture
