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Question : Select the correct passive form of the given sentence. There are three important things to keep in mind while trekking.
Option 1: There are three important things keeping in mind while trekking.
Option 2: There are three important things to be keep in mind while trekking.
Option 3: There are three important things to be kept in mind while trekking.
Option 4: There are three important things to be keeping in mind while trekking.
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