Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions. 
1: A. protection B. control C. pollution D. forest
2: A. biodiversity B. climate C. gorilla D. giant
3: A. book B. look C. flood D. good 
4: A. nature B. manage C. balance D. campfire
5: A. culture B. public C. sustain D. butterfly
6: A. flow B. modern C. project D. online
7: A. distract B. tablet C. strategy D. exchange
8: A. immediate B. schedule C. blended D. lesson
9: A. focus B. control C. role D. modern
10: A. recording B. educate C. children D. device
11: A. gorilla B. environment C. consequence D. respiratory
12: A. tortoise B. ecosystem C. biodiversity D. promotion
13: A. identify B. practical C. habitat D. respiratory
14: A. extreme B. excellent C. execute D. exercise
15: A. brochure B. profit C. local D. follow