In the text,
the word “their” (l.24) refers to “teachers” (l.23).
In the text,
the word “one” (l.6) refers to “definitions” (l.5).
In the text,
the verb tense “had (...) become” (l.2) is in the present perfect.
In the text,
the word “after” (l.8) is a preposition.
In the text,
“must (...) be given” (l.5) can be replaced by can be given.
In the text,
the word “whom” (l.17) can be replaced by which without changing the meaning.
Based on the text, it is correct to say that
grammar practice is not supposed to be tested.
In the text,
the pronoun “it” (l.1) refers to “what” (R.1).
In the text,
the word “particular” (l.10) is synonymous with private.
In the text,
the verb “needed” (l.12) can be replaced by dared without changing the meaning.