The painter is clever in his ______of brushes and colors.
應該填employment還是application？
此題填 application；詞組 in the（ones）application of：意為“在……的應用中”。
The painter is clever in his application of brushes and colors.
【翻譯】這位畫家擅長運用畫筆和顏色。
in the（ones）employment of：受雇于。