21It's likely that ______12:30 flight will be canceled because of _________bad weather.
A. the；a B.a; 不填 C. a; the D.the;不填
22 .The workers had read the operation_______before they began to test the machines.
A. explanations B. instructions
C. descriptions D. introductions
23.--How do you find your new teachers?
--Most of them are friendly and strict, but_____is kind to me as Miss White.
A. none B. no one C. everybody D. anybody
