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 
No trecho do último parágrafo – For large databases, DBA functions will in fact require the full time services of a team of many people. – a expressão in fact indica
No trecho do terceiro parágrafo – Brazil’s unemployment rate remains at historically low levels despite sluggish economic activity. – a palavra despite equivale, em português a
No trecho do quinto parágrafo – Brazil’s unemployment rate, however, is not fully comparable to jobless rates in developed countries as a large portion of the population is either underemployed or works informally – a palavra as pode ser substituída, sem alteração de sentido, por
No trecho do ultimo parágrafo – In addition, workers not actively seeking a job – a expressão in addition pode ser substituída, sem alteração de sentido, por
Um antônimo para a palavra biggest é
A palavra you que ocorre ao longo do texto refere-se a um leitor ideal, que é um
No trecho do segundo parágrafo do texto – All of these people are likely to get their first impression of the company through their interactions with you. – a palavra likely indica
No terceiro parágrafo, a expressão aside from em – In fact, aside from better public health, one of the major benefits of developing sanitation solutions for the developing world… – equivale a
