The main idea defended by the author in the text is that 
The expression of the text “another tip” (line 5) suggests that the author 
In the fragments of the text: “they may lose the desire to master whatever task you are asking them to do” (lines 12-13) and “then you have to do more than just present lessons in the app” (lines 18-19), the verb forms in bold express the ideas, respectively, of 
In the sentence of the text: “However, if you want people to continue using the app, and use it frequently and often, then you have to do more than just present lessons in the app” (lines 17-19), the connector However can be replaced, without any change in meaning, by 
The main purpose of the text is to
Based on the meanings in the text,
According to the text, all the reasons below are benefits that support the choice of a collaborative workplace, EXCEPT:
Google is mentioned in paragraphs 10 and 11 of the text (lines 57-73) in order to
Professor Keith Sawyer mentions that “The group has the ideas, not the individual musicians.” (lines 78-79) to mean that
In the fragment “as those experienced by their bigger counterparts” (line 92) the pronoun those refers to
