“I know they'll challenge us on defense.”
“Journalism is the ability to meet the challenge of filling space.”
“The manager accepts the status quo; the leader challenges it.”
“Freddy's known that this is a challenge since he got into this,”
“Terrorism is a global challenge demanding a global answer.”
“I saw him dealing with challenging kids.”
“Part of the challenge is that they're still defining the regulations.”
“They're getting use to it. The challenge is to be more efficient.”
“I challenged my seniors before the game.”
Change is difficult, since it challenges the status quo.