49. People enter the organization from a(n) _____ range of social, economic, and educational backgrounds.
[A] extensive [B] influential [C] diverse [Dl peculiar
50. The agreement is not _____, because one of the people who signed it is not lawfully old enough to do so.
[A] operative [B] effective [C] legal [D] valid
51. After everyone was seated the chairman ______to announce his plans.
[A] progressed [B] promoted [C] proceeded [D] proposed
52. Teacher`s notes give practical _____ on developing reading skills, together with ideas for implementing play-reading in class.
[A] notions [B] hints [C] perceptions [D] phases
53. His sudden _____ greatly surprised all of us as he was always a very kind man.