Directions : Which of the phrases 1, 2, 3 and 4 given below each sentence should replace the word/ phrase printed in bold in the sentence to make it grammatically correct? If the sentence is correct as it is given and no correction is required, mark 5 as the answer.
According to WWF, the small island nation of Samoa was the first in switch off its lights for Earth Hour
There is incorrect preposition usage.The correct one is "to switch off"
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