Judge the following items according to the text above.
Mobile vendors seeking to foster the consumption of mobile devices are increasingly viewing the challenge as a well-defined technology problem.
When can the deficiency of vitamin B12 cause problems? 
What kind of problems aren´t expected if you suffer deficiency of vitamin B12? 
According to the text, who doesn´t need more B12? 
Why taking certain medications for ulcer and gastric reflux may cause B12 deficiency? 
According to the text, what isn´t correct about vitamin B12? 
The word unnoticed can be substituted by which option? Consider the figure below showing a hypothetical situation. A criminal holds an hostage and against that, a cop (policeman) also holds an hostage who is a friend of the criminal. In this case, criminal is not going to let the hostage go if cop won't let his friend to let go. Also the cop is not going to let the friend of criminal let go, unless the criminal releases the hostage.
Analysing the situation from an Operational System´s point of view, a correct conclusion is
The phrasal verb highlighted in the fragment: ¨DI guess what I'¯m trying to say is, what the fortieth floor lacked in flash it made up for in influence" can be substituted by an expression which adds more formality to its tone. The alternative that best fits the passage is: 
¡°A secretary or personal assistant is a person whose work consists of supporting management, including executives, using a variety of project management, communication, or organizational skills. These functions may be entirely carried out to assist one other employee or may be for the benefit of more than one. In other situations a secretary is an officer of a society or organization who deals with correspondence, admits new members, and organizes official meetings and events.¡¬
(Wikipedia) (Taken from https://en.wikipedia.org/wiki/Secretary Access in 04/02/2017)
The word that best replaces the underlined expression is:
