Ⅰ、1、meaning
2、successful
3、thought
4、survey
5、lives
6、dialogues
Ⅱ、1、He is deep in thought.
2、Those questions are difficult to answer.
3、Let's survey our friends about their thoughts.
4、Why are great people so successful?
5、How can we succeed in life?
Ⅲ、D A A C B
Ⅳ、1、T
2、useful
3、successful
4、Because they made great efforts to learn and work.
5、D
Ⅴ、略