Which country you would most like to visit?	Which country would you most like to visit?	
How often do you do exercise?	How often you do exercise?	
What is your occupation?	What do you do?	
Where is your office?	Where is your office locate?	
Have you married?	Are you married?	
How long you are studying English?	How long have you been studying English?	
How long does it take you to get home from here?	How long time does it take you to back to home from here?	
What kind of languages can you speak?	Which languages do you speak?	
Who cooks your breakfast?	Who does cook your breakfast?	
What is your job nature?	What does your job involve?	
What did you eat today?	What have you eaten today?	
When was the last time you travelled abroad?	When did you travel abroad last time?	
What will you do after the class?	What are you doing after the class?	
Do you has many pets at home?	Have you got any pets at home?	

Answers	

Which country you would most like to visit?	Which country would you most like to visit?	Word order: which + noun + would + subject	
How often do you do exercise?	How often you do exercise?	Missing auxiliary: present simple questions take the auxiliary 'do'	
What is your occupation?	What do you do?	The first is only appropriate in very formal written English.	
Where is your office?	Where is your office locate?	'Where is your office located?'
is possible in formal written English. Note 'located' must be pronounced with three syllables	
Have you married?	Are you married?	'Married' is an adjective here.	
How long you are studying English?	How long have you been studying English?	Present perfect continuous is necessary for an incomplete action starting in the past.	
How long does it take you to get home from here?	How long time does it take you to back to home from here?	How long + does it take + subj.
Note 'back' is not a verb meaning 'return' in English	
What kind of languages can you speak?	Which languages do you speak?	What kind of... means what type of. Not appropriate here.	
Who cooks your breakfast?	Who does cook your breakfast?	Subject question necessary.	
What is your job nature?	What does your job involve?	'Job nature' is a written form that might be found in an form or similar document.	
What did you eat today?	What have you eaten today?	'Today' is an unfinished time period, so present perfect is necessary.	
When was the last time you travelled abroad?	When did you travel abroad last time?	When did you last travel abroad? is also possible	
What will you do after the class?	What are you doing after the class?	You would expect somebody to have some plans for the very near future, so present continuous is used.	
Do you has many pets at home?	Have you got any pets at home?	'Have you got...' is common in spoken English. 'Do you have..' is possible in more formal situations.