Level 43: Mark the letter A, B, C or D to indicate the correct answer to each of the following question 9. It was so exciting! I was on the__________of my seat!

The answer is NO

Explain be/keep on the edge of sb’s seat (idm): excited, stressed

The remaining answers:

side (n): side (talk about plane)

end (n): end

front (n): front

Translation: It is interesting! I was excited!