1, He's a hard nut to crack.

2, Mary found knitting a hard nut to crack.

3, Jeff: This is indeed a hard nut to crack.

4, This is really a hard nut to crack.

5, Where some people a hard nut to crack.

6, It is a hard nut to crack.

7, This problem is a hard nut to crack.

8, He is a hard nut to crack.

9, My boss a hard nut to crack.

10, That's a hard nut to crack.

11, It was then a hard nut to crack.

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13, They say that she is a hard nut to crack.

14, The third question in the examination is a hard nut to crack.

15, This problem is going to be a hard nut to crack.

16, How to tackle the non-performing asset is a hard nut to crack for bank industry all over the world.

17, Crikey, is he a hard nut to crack. I don't think he watches MLS.

18, When I meet a hard nut to crack, it will help me.

19, The difficult terrain of the Pennines will be a hard nut to crack.

20, I asked them for the money, but they were a hard nut to crack.

21, Screed is an important part of a paver. Welding distortion and difficulty to ensure machining accuracy have been a hard nut to crack in manufacturing processes of screeds.