10. road, street, path, way
road具体的公路，马路，street街道，path小路，小径，way道路，途径
take this road; in the street, show me the way to the museum.
11. course, subject
course课程（可包括多门科目），subject科目（具体的学科）a summer course
12. custom, habit
custom传统风俗，习俗，也可指生活习惯，后接to do， habit生活习惯，习惯成自然，后接of doing. I've got the habit of drinking a lot.
13. cause, reason
cause 指造成某一事实或现象的直接原因，后接of sth./doing sth，reason用来解释某种现象或结果的理由，后接for sth./doing sth. the reason for being late
14. exercise, exercises, practice
exercise运动，锻炼（不可数），exercises练习（可数），practice（反复做的）练习 Practice makes perfect.
15. class, lesson
作"课"解时,两者可以替换.指课文用lesson. 指班级或全体学生用class. lesson 6; class 5
16. speech, talk, lecture
speech指在公共场所所做的经过准备的较正式的演说，talk日常生活中的一般的谈话，讲话，lecture学术性的演讲，讲课 a series of lecture on…
17. officer, official
officer部队的军官，official政府官员 an army officer
18. work, job
二者均指工作。work不可数，job可数 a good job
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