1. The mountain climb presented a significant _______ for the experienced hiker.(challeng-)

1. The new kitchen _______made cooking more efficient and enjoyable.(apply)

1. The police thoroughly investigated the ______ of fraud against the company.(allege)

To ensure accuracy, scientists use rigorous methods to _____ experimental results (valid)

1. The detective investigated the case involving a known ______ in the community. (Deviate)

1. The _______ universe continues to captivate astronomers with its vast and dynamic nature.(expand)

1. As a seasoned chess player, she eagerly awaited a worthy ______ to test her skills.(challenge)

She didn't ______to cause any harm with her words.(intention)

1. Be cautious when dealing with _______ claims on the internet, as they may lack credibility.(verify)

1. _______ mistakes can happen, but it's important to learn from them and strive for improvement.(intend)