101.  The September quarter is usually a tough one for entertainment software companies because many purchases are deferred to the holiday buying season in the December quarter.

102.  The traffic problem, as any car commuter can testify, is a tough one.

103.  The step after that, now that could be the tough one.

104.  Then Lofty comes up with a tough one.

105.  They also come with varying suspensions, from a smooth on-road configuration to a tough off-road one.

106.  These are not impossible tasks, just tough ones.

107.  They said Amani made the easy catches but on the tough ones he would disappear on you.

108.  This is a tough one for Dole to swallow.

109.  This is a tough one to read.

110.  This is a tough one for the Republicans.