11.   The last question really left us scratching our heads.

12.   The thrift president scratched his head at the numbers.

13.   This crisis has politicians scratching their heads and wondering what to do.

14.   When I scratched his head, he would not hold still as long as before.

15.   Where possible he would seize scraps of parchment and draw lines, muttering to himself and scratching his head.

16.   He scratched his head.

17.   Tommy scratched his head thoughtfully.

18.   He scratched his head and messed his hair even more.

19.   The Institute spends a lot of time scratching its head about how to boost American productivity.

20.   With the other hand, Garvey was scratching his head in puzzlement.