Youd better see a doctor is the contration of: 
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.
Judge the following items, concerning the ideas and linguistic aspects of text 19A1AAA.
As in the phrase a language school in Verviers, Belgium run on Berlitz lines (l. 2 and 3), the relative pronoun and the auxiliary verb which forms the passive voice have been omitted, the excerpt run on Berlitz lines could be correctly replaced with which was run on Berlitz lines.
Judge the following items, on the linguistic aspects of text 19A1AAA.
In the text, the connective adverb however (l.7) is synonymous with nonetheless.
Judge the following items, on the linguistic aspects of text 19A1AAA.
The verbal phrase allowed him to live abroad (l.4) can be correctly replaced by allowed him living abroad.
Judge the following items, on the linguistic aspects of text 19A1AAA.
In like many others before and since (l. 6 and 7), the verb phrase would have done is omitted.
Based on the text 19A1BBB, judge the following items.
The verb confine (l.12) is synonymous with restrict.
Based on the text 19A1BBB, judge the following items.
The word Instead (l.14) can be correctly replaced by Moreover.
Judge the following items according to text 19A3AAA.
The sentence However, there are other causes for errors too, one of which is overgeneralization of target-language rules would remain correct if which were replaced with them in the clause one of which is overgeneralization.
Judge the following items according to text 19A3BBB.
It is correct to replace calling with call in the phrase used to calling (l.17).