单项选择题
Why are some of us good at math, or writing, while others（）at art or basketball
A. work B. gaze C. aim D. excel
单项选择题 You may make good grades by studying only before examinations, but you will succeed eventually only by studying hard every day（）
单项选择题 As a writer Walkter was very （）
单项选择题 Although she was still ill, she（）herself from the hospital.
