वह विकल्प चुनें जो वाक्य के रेखांकित भाग को बेहतर बनाएगा। यदि कोई सुधार आवश्यक न हो, तो 'No Improvement' चुनें।

The scientists are busy to explore new ideas.

1
exploring
2
No Improvement
3
for exploring
4
to be exploring

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