Circle the words which has underlined part pronounced differently

Question 2: Circle the words which has underlined part pronounced differently
1. A. clever
B. generous
C. gentle
D. explore
 2. A. lesson
B. music
C. sandcastle
D. countryside
 3. A. seaside
B. beach
C. learn
D. peacock
 4. A. think
B. they
C. this
D. those
 5. A. crocodile
B. cave
C. once
D. crowded