11.   The independence wars are not freak events but desperate efforts at cultural survival.

12.   The other qualification relates to initial efforts at industrial diversification.

13.   The President made a rum effort at greeting her news with enthusiasm, but I could see he was crestfallen.

14.   The scale of the enterprise is so large that fourteen nations combine their efforts at this single lab.

15.   The workers went on strike after efforts at negotiation with management broke down.

16.   Further efforts at negotiation have broken down.

17.   Mary Ann had made an effort at jazzing up the chilly modern interiors.

18.   ...elaborate efforts at the highest level to conceal the problem.