11.   The noise of the machines made it hard to talk.

12.   The volatility of their earnings also made it hard for them to deal with the liability concerns raised by employing a student.

13.   They spoke in quiet voices which made it hard to eavesdrop.

14.   This lack of communication makes it hard for them to reach the milestones described earlier and to achieve healthy emotional development.

15.   This makes it hard to use the information it provides constructively.

16.   This must make it hard for the agencies who undertake to deliver telephone sales messages.

17.   William Yes-might make it hard to strike a really romantic note.

18.   The weight of her boots made it hard for Sue to run.

19.   The geography of the flats made it hard to get to know our neighbours.

20.   All the hubbub in the airport made it hard to hear the flight announcements.