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The phrase "economic challenges across nations" indicates that these challenges are spread or present in various countries, so "across" is the correct preposition to use.
Which person among the following likes Badminton?
Who lives on 2nd floor?
Which fruit is liked by the person who lives on 8th floor?
How many persons live below F (in the same type of flat)?
Which of the following is the correct Function – Day combination
Which of the following statements is/are not true?
Who is the Doctor?
Johnny went to which of the following Islands?
Six friends Arunesh, Jitend, Charu, Devansh, Pradeep and Kitu live on different floors of a six-storey building. Charu does not live on the top floor. O...
Who among the following likes Labrador?