QUES: Therefore fits Switzerland as conference room for all the worlds countries

correct the punctuation.

CORRECTED: Therefore fits Switzerland as conference room for all the world's countries.

QUES: There is plenty of things under the table that the public knows nothing about

correct the punctuation.

CORRECTED: There is plenty of things under the table, that the public knows nothing about.

QUES: AZ of Key Account Management eBook Software Home Education Ebooks Literature

correct the punctuation.

CORRECTED:
A-Z of Key Account Management eBook - Software: Home & Education: E-books & Literature