19．-Congratulations!I hear you passed the driving test the first time you took it．-Thanks．You know.I——青夏教育精英家教网——

19．-Congratulations!I hear you passed the driving test the first time you took it．
-Thanks．You know，I full preparations for it．（　　）

18．Experts are talking about the problemsconcerning （concern） air pollution at the meeting now．

17．Acommercial（商业的）advertisement is one which someone has paid for to promote a product or service．

16．Don'thesitate（犹豫，迟疑）to make comments or suggestions if you have any．

15．"White collar"is a near-synonym for middle class，and"blue collar"for working class．Thedistinction（区别，差别）comes from the work"uniforms"traditionally worn in each environment．

14．Everyone can enroll on self-study courses in the university's languageinstitute（学院，机构）．

13．With the development of tourism，more localemployment opportunities（就业机会） will be created，particularly in service industries．

12．As we all know，the official languages of Canada are French and English．

11．An encouraging word to those who are down can help them out while a discouraging word can kill them．

10．To my great relief，I finally passed the driving test after many times of failure．

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