Spell Well 21

Spell Well 21 - 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.
know
knife
knick-knack
knob
knee
knight
unknown
knit
kneel
knot
knock
knuckle