In text 9A3BBB, the word thought, both in line 4 and line 6, is 
An example of passive voice taken from text 9A3BBB is 
Modifying the verb tense of the clause the frogs were going to arrive a month ahead of schedule to future, the correct form of were going to arrive becomes 
In text 9A3CCC, a pronoun that introduces a relative clause is 
Based on the text, judge the following items.
Therefore is a suitable substitute for "So" (line 8).
Based on the text, judge the following items.
In "the inspectors" (line 5), the definite article can be omitted.
Based on the text, judge the following items.
The sentence "the inspectors recommend the introduction of homework charters (lines 5 and 6) can be expressed as follows: The inspectors recommend to introduce "homework charters".
Based on the text, judge the following items.
A person from "Poland" (line 12) is a Pole.
Based on the text, judge the following items.
The preposition up in crept up (line 6) is optional.
Based on the text, judge the following items.
The singular form of these (line 11) can be this or that.