45. This is the school __________ I learned English. A. that B. who C. where D. which 46. I didn’t understand the reason _____ you behaved so strangely at the party last night. A. which B. that C. what D. why 47. Thanks for this interesting book, __________ is bilingual, I can understand much more about American culture and improve my English at the same time. A. that B. which C. who D. both A & B 48. He can speak English quite fast, but he still needs to improve his __________. A. fluent B. fluency C. accurate D. accuracy 49. Keiko is from Japanese, and she can speak English. Therefore, she is a __________. A. native English speaker B. English native speaker C. non-native English speaker D. English non-native speaker 50. If you possess a good __________ of English, it is very easy for you to get a well-paid job in multinational companies. A. level B. skill C. command D. ability