1 . To our great _______(delighted), it worked perfectly.

2 . I am ________(delight) to inform you that this year’s music festival will be held shortly. (所给词的适当形式填空)

3 . After a long struggle, exhausted but ______________(delight), all the members reached the peak of the mountain.

4 . To my ________ (delight), all the judges are satisfied with my behaviour. （所给词的适当形式填空）