1.

1). Whether only we should fly2). If only we could fly3). If only we will fly4). No improvement

Answer»

The sentence uses the modal VERB 'would', suggesting the possibility of something happening. So, the verb from the bracketed part must also reflect this possibility.

Should represents a DUTY, and hence is incorrect. The correct verb here becomes 'could', which shows a possibility and WORKS with the other verb 'would'.

The conjunction 'whether' is used to show a choice between alternatives. But, given the context, the conjunction 'if', which suggests a general possibility is appropriate here.

Therefore, the correct ANSWER is OPTION 2.

Improved sentence - If only we could fly$, we would have seen the whole world.$



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