Помогите с англ языком вставить do, does, -.И объяснить почему

Question

Нужно вставить пропущеное слово does, do или нечего то бишь '-' 
Where _ your parents spend their vacation? 
What _ your father do in his spare time? 
When _ your father go to work? 
Why _ they learn poems by heart? 
Why_ your sister go shopping on Saturday ? 
Who_ you always walk your dog with? 
Who_ his like to play chess witch? 
Who_knows the way out? 
What time_ your sister come back home? 
How often _ you go swimming? 
How often_ Dan come to the club? 
Whose parents_ want to help us? 
Which of your sister _ live in the country? 
Which letter _ come after 'I'?

Ирина · Accepted Answer

Where do_ your parents spend their vacation? 
What does_ your father do in his spare time? 
When does_ your father go to work? 
Why do_ they learn poems by heart? 
Why does_ your sister go shopping on Saturday ? 
Who always walks your dog with? 
Whom does he like to play chess witch? 
Who knows the way out? 
What time does_ your sister come back home? 
How often do_ you go swimming? 
How often does_ Dan come to the club? 
Which of your sister lives in the country? 
Which letter coms after 'I'?