In “to provide unrivalled...which are rarely published” WHICH can be replaced by: 
All of the itens fit into the same category EXCEPT: 
“Weights and Measures laws in the US represent approximately 50 percent…” APPROXIMATELY is closest in meaning to 
Choose the item which is a measure: 
In “Here’s $100 to make sure” MAKE SURE is closest in meaning to: 
According to the previous text, judge the following items.
The word ‘changing’ (l.13) conveys the idea that threats are constantly evolving.
Among the many tasks, mentioned in the third paragraph, a police officer may perform in the line of duty, is to “secure evidence”. The phrase means, in Portuguese, the same as 
No trecho do último parágrafo – Police officers must be available for shift work at any time of day and any day of the week, including holidays. –, a palavra em destaque transmite a ideia de 