Use the correct form of the word given in each sentence

(21-25). Use the correct form of the word given in each sentence.

21. The label identifies the products that are least______ to the environment, (harm)

22. I find the nature world endlessly_______ . (fascinate)

23. Murphy retired at the end of a 30-year_______ career, (teach)

24. The team put in an excellent_________ at the World Cup. (perform)

25. UFO means________ Flying Object, (identify)