1.   The Internet has been an effective tool for advertising.

2.   It is also presented as a effective tool in ensuring a level supply of milk as the number of active dairy farmers in Europe continues to decline.

3.   And it was an effective tool to keep power in a few hands.

4.   And the computer has emerged as a highly effective tool for achieving that goal.

5.   At the same time, call screening has introduced an effective tool for avoiding communicating, such as when telemarketers, bill collectors, or relatives call.

6.   At the same time, administrators find leadership development programs to be effective recruiting tools.

7.   At home, in our communities, we are still turning to politics as the single most effective tool to bind us in common cause.

8.   Blame can be an effective teaching tool, but overusing it can quickly diminish its effectiveness.

9.   A bikini can be a very effective tool of persuasion.