Keywords with a bid lower than the minimum required for showing on the first page will rarely get impressions.  Consider increasing their Max CPC to the first page bid level.

Adalysis will alert you to such keywords on the dashboard:

Step 1

Clicking on the above alert will take you to the Keywords screen with the relevant filter pre-loaded showing you the keywords with lower than first page bid:

Step 2

To increase the keywords' Max CPC, you can either modify each keyword individually by clicking on its Max CPC and modifying it, or use the Increase Max CPC to first page bid... tool to modify them in bulk with a one button click.