Choose the word whose underlined part differs from the other three in pronunciation in each of the following questions

Choose the word whose underlined part differs from the other three in pronunciation in each of the following questions 
1) A blackboard B plumber C garbage D volleyball 
2) apologizes B changes C invites D exercises 
Choose the word that differs from the other three in the position of primary stress in each of the following questions 
3) A understand B comedy C garvity D customer 
4) A climate B highland C weather D typhoon