Fill in the blank with the correct word from the options given below:-
_____ the rain stops, the concert will have to be postponed.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → unless
Unless is a conjunction meaning "except if" or "if not." It introduces the condition that must be met to avoid the consequence.
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Meaning: If the rain does not stop, the concert will have to be postponed.
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until / till → talk about time, not conditions.
Using them would incorrectly imply the postponement itself lasts until the rain stops. -
while → means “during the time that,” which changes the meaning entirely.