“Teachers can change lives with just the right mix of chalk and challenges.”

“These will to some extent contribute to a more challenging business environment for the property market.”

“Sometimes a player's greatest challenge is coming to grips with his role on the team.”

“Challenge is a dragon with a gift in its mouth. Tame the dragon and the gift is yours.”

“I challenge anyone to examine the agreements to see if it is a violation to train members.”

“All schools in our conference are pretty good. The conference should be a challenge.”

“It will be a challenge (for the IRL cars), ... Some guys will be able to do it better, of course.”

“It is a challenge in general to change an image, especially the image of an entire product category.”

“Integrating everyone at different levels has been a challenge, but it's not insurmountable.”

“The bill is so facially unconstitutional, the likelihood that it will not be challenged in court is practically nil.”