1.   He strove to think on a different plane of reason and insight.

2.   I think on balance I prefer the old system.

3.   In this job you need to be able to think on your feet.

4.   Industry today needs workers who can think on their feet and relearn their jobs constantly.

5.   It needs to think ahead on a systematic basis.

6.   Most people are nicer than you think on first acquaintance.

7.   My first impulse was to go straight to Henry and tell him my news, but on reflection I thought better of it.

8.   On balance I think it would be better to cancel the arrangements.

9.   She clasped them and tried to think on her feet.