1. ________ you are in the world of business or the world of social relations, the way you dress can make a tremendous difference.
A)No matter B) Whether C) Although D) Either
2. To some people, Mickey Mouse is seen as the spread of American culture to other countries ________ he reflects American imperialism and ideas.
A) when B) what C) where D) which
3. ________ most of his time devoted to the extracurricular activities, Allen, one of the gifted students in my class, got only mediocre scores in his major studies.
A) When B) With C) Despite D) Although
4. Finland is the least densely populated country on the continent and ________ its five million residents enjoy one of the highest standards of living anywhere.
A)alike B) then C) thus D) yet
5. _____________ for his diligence and persistence, the new deputy director is expected to bring up the office morale.
A) To know B) Knowing C) By knowing D) Known
答案是 bcbdd
可以幫我解釋以上五題的文法概念嗎 謝謝