111.   Setting up the network did present some challenges.

112.   Shooting the film in Ukraine and Bulgaria presented different challenges.

113.   She was a walker in her Arlington Heights neighborhood, where the hills can present a challenge to calves decades younger than her own.

114.   Signing up to receive these e-mail newsletters can also present challenges.

115.   So while baby boomers may be an affluent and appealing target segment, they also present a challenge to marketers because of the complexity.

116.   Somber and often unmotivated to spend money, yet arriving in large numbers, they have presented a challenge to marketers, downtown residents and small businesses.

117.   Still, change presents challenges.

118.   Still, there was general agreement among educators that the results present a challenge to the conventional wisdom about public and private education.

119.   Taking photographs of the paintings presents a challenge.

120.   Technology for conducting submarine searches has improved since then, but Loch Ness still presents daunting challenges.