Select the most appropriate option to fill in blank 1.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. helpful.
- The word "helpful" is suitable in the context of the sentence because it conveys a positive and supportive tone.
- The other options "demanding," "distasteful," and "challenging," do not align with the likely positive nature of a series designed to enhance language skills.