Odd one out

I. Odd one out:(0,5m)
1. A. star
B. father
C. camera
D. garden
 
2. A. heart
B. heard
C. learn
D. hurt
 
3. A. fast
B. class
C. answer
D. apple
 
4. A. check
B. recycle
C. reuse
D. environment
 
5. A. each
B. sea
C. create
D. idea