Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.

[Q]: Relationship: 'be require to view', Argument/Subject 1: 'adobe acrobat', Argument/Subject 2: 'pdf'
[A]: Adobe Acrobat required to view all PDF 's .

[Q]: Relationship: 'be hold in', Argument/Subject 1: 'world economic forum', Argument/Subject 2: 'davo'
[A]: Davos , where the 2009 World Economic Forum is being held .

[Q]: Relationship: 'be own by', Argument/Subject 1: 'corbi', Argument/Subject 2: 'bill gate'
[A]:
Corbis is a private company wholly owned by Bill Gates .