21.   He was especially effective on the final two drives of the game when the Cowboys rallied for a field goal and a touchdown to gain the victory.

22.   He speaks perfect English, in a rich, beguiling voice that is particularly effective on television.

23.   His postdated letter of resignation becomes effective on Saturday.

24.   Hungry is nice, but effective on the mound is better.

25.   I have found a simple spray of liquid anti-perspirant is effective on any trouble spot.

26.   In addition, overuse of newer drugs is rendering them less effective on the more severe infections for which they were developed.

27.   In fact, penicillin has been effective on the strains of anthrax discovered in New York and Florida.

28.   It also turns out that Sanchez is developing into one fine congressman, increasingly effective on national issues.

29.   It may be as effective on salmonella, listeria and other bugs, according to a recent study.

30.   It is particularly effective on traditional woodwork and furniture.