In text 9A3AAA, the word its (l.1) is a 
In text 9A3AAA, a modal verb is 
In text 9A3BBB, has had (l.3) is used to emphasize an event that happened 
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 
In text 9A4BBB, pretend (í.14) is synonymous with 
Based on the text, judge the following items.
"even if" (line 7) can be replaced by even though without affecting the meaning of the sentence.
Based on the text, judge the following items.
Therefore is a suitable substitute for "So" (line 8).