Theory:

     I had heard a great deal about Miss Beam’s school, but not till last week did the chance come to visit it.
Explanation:
 
The story opens with the narrator talking about a school.
 
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The school is run by a lady known as “Miss Beam”.
 
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From the description of the narrator, it is evident that school is quite famous. It could be understood when the narrator says that he had heard “a great deal about” it. Also, the first paragraph reveals another significant information; the story he is about to share happened in the previous week.
 
Meanings of difficult words:
 
Sl. No.
Words
Meanings
1
Great dealA lot
2
ChanceOpportunity
Reference:
National Council of Educational Research and Training (2006). Honeysuckle. A Different Kind of School - E. V. Lucas (pp. 56-62). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.