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A musician friend of (me改成mine) once went on an English course during his summer holidays. What he really (wants改成wanted) to do was to improve his ability to think and react (quick改成quickly) in the spoken English. He said (speak改成speaking) in a foreign language always made him nervous, even if after three years of study. One of the (teacher改成teachers) on the course had very strong views on music, (but改成and) was not afraid to express them in lessons. My friend spent most of the class time (on改成in 或 去掉on) arguing about music with (a改成the) teacher. When his course finished, he found that his nervousness in English (has改成had) completely disappeared, and he was speaking far (加入more) fluently than before.