【正文】
the students around looked at me. I was totally 30 , and my face went red. 21. A. different B. important C. practical D. unusual 22. A. national B. embarrassing C. cultural D. amazing 23. A. exits B. entrances C. signs D. doors 24. A. enter B. leave C. open D. close 25. A. main B. same C. front D. back 26. A. annoying B. hard C. satisfying D. strange 27. A. parents B. students C. teachers D. driven 28. A. sooner B. later C. faster D. easier 29. A. politely B. patiently C. unconsciously D. slowly 30. A. embarrassed B. annoyed C. unsatisfied D. excited