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 
Judge the items that follow based on the text above.
“that conventional view” (l.9) refers to the theory that modern humans came from just one single place in Africa.
Based on the text above, judge the following items.
“in the first place” (l.7) means basically the same as to start with.
Based on the text above, judge the following items.
The expression “People used to think” (l.4) suggests that they no longer think that way.