1 . Darkness would make him more ________ of sight, silence would teach him the joys of sound.

A．delighted

B．delightful

C．appreciative

D．worthy

2 . The old man was ________ (delight) to hear that his son had come back. （所给词的适当形式填空）

3 . _____(delight) as I was by the tomatoes in sight, my happiness deepened when I learned that Browns Grove Farm is one of the suppliers of a newly opened restaurant. (所给单词的适当形式填空)