28. Every student in this school must have a ________ of black trousers, black shoes, and a white shirt.
(A) uniform (B) quantity (C) drawer (D) military
21 .______,I didn’t like Bill at all. However,after working with him for a while, I understand he is
really a nice man.
(A) At first (B) Above all (C) At last (D) In the end