用适当的疑问词填空.----did you play the piano when you were 10 years

用适当的疑问词填空.-___did you play the piano when you were 10 years old?-Every day.
为什么中国政府不想让外国工程师建筑那条铁路？
Why __the　Chinese　＿＿＿　want　foreign　＿＿＿　to　build　the　＿＿＿？