Is There a Silent Letter?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
   no      yes   
1. Is there a silent "n" in knot?
2. Is there a silent "k" in know?
3. Is there a silend "f" in knife?
4. Is there a silent "k" in known?
5. Is there a silent "m" in limb?
6. Is there a silent "b" in comb?
7. Is there a silent "c" in column?
8. Is there a silent "h" in herb?
9. Is there a silent "r" in honor?
10. Is there a silent "t" in whistle and thistle?