1.   Already, the newer venture firms say it has become challenging to raise money.

2.   As you get older and life becomes increasingly challenging, remember that tough challenges are what make our lives worth living.

3.   Navigating the local supermarket has become increasingly challenging for Shari Hartford.

4.   The music somehow remains amorous, but it gains an effervescence, because at this clip its famous mandolin and guitar parts actually become challenging to play.

5.   Many Turks in tourist areas speak English, but communication becomes increasingly challenging off the beaten track.