1.  They know everything that other students don't, and they can solve any problem which is far too difficult for others.

2.  That was a difficult task especially when we just had 6 group members.

3.  For me, it was difficult for me to imagine how people can survive in such an environment.

4.  One is that everyone thinks what they learned is the most difficult subjects.

5.  It is obvious to learn that students always think that they are studying the most difficult subjects.

6.  My dorm mate gradually told us some interesting things in the course and when she finished the homework successfully or worked out some difficult question she was excited more than ever.

7.  Every time her classmates met some difficult problems, she was the first choice for them to turn to.

8.  It is not difficult to understand.

9.  In the past five-years I was difficult to read some professional essays, however, I can understand the meaning of those articles basically through the intensive courses of the entrance examinations of postgraduate students and extensive reading.

10.  Therefore, for me, maybe getting a good result in an examination is not that hard, but it is difficult to perform well in real-life communication .