1.The invention of paper was a great contribution to human (文明).
答案civilisations
2.It was once common to (看待) Britain as a society with class distinction.
答案regard
3.Having strong motivation(动机) is one of the biggest (因素) in reaching goals.
答案factors
4.For many nations,blue is a (象征) of protection and religious beliefs.
答案symbol
5.Now this former royal palace is open to the public as a (主要的) tourist attraction.
答案major
6.Mike,Mary and I had a discussion about the reading of the (传统的) literature yesterday.
答案classic
