In the first line of text 3A7AAA, the expression Due to could be correctly replaced by 
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 
Judge the following items, concerning the ideas and linguistic aspects of text 19A1AAA.
The prepositional phrase at a language school in Verviers, Belgium (l. 2 and 3) functions as an adverb.