21.   He feels the nomadic lifestyle contributed to a shyness which has made it difficult for him to establish close friendships ever since.

22.   Her fear was almost choking her, making it difficult to breathe.

23.   However, the demands of the experimentalists make it difficult to provide a simple description of the meaning of the calculations.

24.   Inadequate lighting made it difficult to continue the work after dinner.

25.   Insurers are cutting the yield because prevailing low interest rates have made it difficult for them to meet commitments.

26.   Is the guy trying to make life difficult for music critics, or what?

27.   Low self-confidence also made it difficult for Sean to sustain independent effort.

28.   Most beginners apply the opposite rudder too harshly and this makes it difficult to hold the bank constant.

29.   My first boss was a really nasty person, who seemed to enjoy making life difficult for everyone.