Spell Well 10

Spell Well 10 - an exercise made by MrsAki on Spellic.com.
1. Fold the right part of the paper back so that you can't se the answers.
2. Write the correct answer in the space below each question.
3. When done, fold the paper back and compare your answers.
knock
back
brick
kick
clock
thick
sick
black
sock
lick
duck
stick