When dealing with students, teachers are supposed to adopt ______ and caring approaches, as they are unique young individuals of different personalities. 

This is the _____ piano on which the composer created some of his greatest works.

 He was really _____to find that John’s joke was so______.

 Mr. Smith is very happy because the cars made in his factory have never been ______.

This year they have produced＿＿＿grain＿＿＿they did last year.