21.   He said such efforts are proving to be effective in keeping kids out of trouble.

22.   Her efforts could also prove more difficult now, because the first batch of contributions is often the easiest to take in, political experts say.

23.   His previous efforts proved rewarding for shareholders of Sino Land Co., where Ng serves as chairman.

24.   However, the first effort proved a quick misstep.

25.   If they do strike, the effort could prove suicidal.

26.   In some cases, scientists say, these efforts have proven fruitful.

27.   Peace efforts may prove increasingly difficult, given signs that the various Islamic opposition factions once united under the banner of the Salvation Front are now splintered.

28.   Privatization efforts have proved successful not only in several foreign countries, but also several U.S. jurisdictions.

29.   Researchers will have to go back to basic research on how the virus behaves and does its damage, so limited have initial drug and vaccine efforts proved.

30.   So far, his efforts have proved futile, largely because the conservatives find the whole prospect distasteful regardless of what language is used.