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CHALLENGING / CHALLENGE / CHALLENGER / CHALLENGED
1. The young athlete proved to be a strong in the competition. 2. Learning a new language can be , but it is very rewarding. 3. His authority was by the employees during the meeting.
POSSIBILITY / POSSIBLE / IMPOSSIBLY / POSSIBLY
1. She will arrive late due to the traffic. 2. There is a of rain tomorrow. 3. It seemed to finish the project on time, but we did it.
SKILLFUL / UNSKILLED / SKILL / SKILLFULLY
1. The dancer performed a difficult routine. 2. The company offers training programs for workers. 3. His negotiation saved the company thousands of dollars.