Điền từ còn thiếu vào chỗ trống

What _ _ _ _ _ going by bus? – Nice idea!

https://res.ioe.vn/edu/EOlympic/ExamData/ImageExam/2018/4/5/636585454638379734_566X320.jpg

John: What music instrument can you play? - Linh: I can play the o_ _ _ _ .
Because Jim is _ _ _ _ _ - sighted, he can’t read what is on the boars.