题目内容：

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

The Van Gogh Museum in Amsterdam-home of the world’s largest1.(collect) of Van Gogh’s works-has carried out an extensive x-ray study of some pieces, only2.(discover) the Dutchman’s famous Sunflowers is in the process of losing its color. The scan, carried out by Dutch and Belgian experts, shows that the lemon-yellow color in the flowers’ petals and stems3.(be) slowly turning brown because of being exposed 4.lights.

The color change in the work is not visible to the naked eye yet, but it is still unclear when and if the yellows of the canvas5.(darken) soon. However, the Amsterdam museum’s discovery could have a wide significance, 6. Van Gogh could have used the same paint in the other Sunflowers or even in paintings with other subjects. Marije Vellekoop, head of the research at the museum said, “At the moment, we are processing all the research results of this painting, after 7. we will determine how we will pay 8.(far) attention to discoloration in our museum.”

Moreover, the discovery could lead to changes in how Van Gogh’s works are stored and shown internationally. The Van Gogh Museum is 9.(continuous) exploring ways to preserve and restore the productive painter’s works, 10.(lower) the lighting around its 200 paintings and 400 drawings five years ago.