Passage below is accompanied by a number of questions.

 For some questions, consider how the passage might be revised to improve the expression of ideas. For other questions, consider how the passage might be edited to correct errors in sentence structure, usage or punctuation.
Alter reading the passage, choose the answer to each question that most effectively improves the quality of writing in the passage or that makes the passage confirm to the conventions of standard written English.
The underlined areas in the passage along with the [number] direct you to the question concerned

If you've ever been to an art museum, you know the basic layout: long hallways and large rooms with paintings hung a few feet apart You know how the paintings are [34] by certain means are marked and you know that the paintings have been arranged chronologically or thematically.

There’s one thing, however, which you’ve definitely noticed even if you can’t quite articulate it- Particularly when looking at old paintings. [35] paintings all have that vividly new look, Whether they were painted in 1950 or 1450. Even where the subject matter is older, the colors are vibrant, and you're never forced to wonder exactly what the painting must have looked like in its original state.
[36] The history of painting is nearly as long as the history of mankind. The incredible feat is the work of a highly specialized group: art restorers. Despite this specialization, the profession has exploded in recent years. Art restoration has been growing steadily since 1930. While the job of an art restorer may seem fairly straight forward [37] When looking, the job is in fact quite complicated: Sometimes, as in the case of Michelangelo's famous sculpture David, the cleaning and restoration of art works is a simple matter: applying chemicals, washing away grime and scrubbing of the dirt.
[38] With most paintings however, the process is a good deal more involved because it is not necessarily, just a matter of 'cleaning' the older paintings. One cannot merely take a scrub brush to centuries - old great work, Because of the wide range of restoration techniques, art restoration itself can be controversial business.