Find the word which has a different sound in the part underline

Exercise 1: Find the word which has a different sound in the part underlineD.
1. A. exhibition B. question C. collection D. tradition
2. A. pleasure B. leisure C. closure D. sure
3. A. discussion B. decision C. treasure D. vision
4. A. saxophone B. music C. so D. expensive
5. A. similarity B. talent C. happy D. hard
Exercise 2: Find which word does not belong to each group.
1. A. saxophone B. guitar C. violin D. artist
2. A. camera B. photograph C. portrait D. opera
3. A. ballet B. pop C. rock D. rap
4. A. singer B. actor C. film director D. film producer
5. A. canvas B. water puppet C. crayon D. pencil