According to WWF the small island nation of Samoa was the first in switching off its lights in suppo...........

English ( Master) Phrase Replacement

Directions: In this question, a sentence has been given with some of its part in bold. To make the sentence grammatically and idiomatically correct you have to replace the bold part with the correct alternative given below. If the sentence is correct as it is, mark 'No improvement required' as your answer.

According to WWF, the small island nation of Samoa was the first in switching off its lights in support of the Earth Hour.

first to switch of

the first to switch off

the first to switch of

the first in switch off

No correction required

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Explanation:

To express a purpose the infinitive form (to switch off) of a non-finite verb is used instead of the gerund one (switching off). Besides, the correct phrasal verb is 'to switch off' and not 'to switch of'.

Ex. I come here to study. (Corrrect)
Ex. I come here for studying. (Incorrect)

Option B is hence the correct answer.