11.   And in the absence of efficient means for synthesizing DNA, his work was not reproduced for many years.

12.   Bigger means more efficient.

13.   A Nascar stock car has been described as the most efficient means ever devised of converting gasoline to noise.

14.   CD-ROMs, some no larger than three inches in diameter, are an efficient means of storing massive quantities of information on a small disc.

15.   Computers are an efficient means of delivering facts to students, just as standardized tests are a handy method of retrieving them.

16.   County and city officials are voicing their support of aerial spraying, saying it is the most efficient means of eradicating the insect.

17.   Even countries that have instituted new regulations have no efficient means of enforcement, the memorandum said.

18.   Hand-held wands offer an efficient means for placing water at the base of plants quickly.

19.   It is obvious that a racing car can be both a dangerous missile and an efficient means of transportation.

20.   Like Epstein, he finds the Internet a positive force that, among other benefits, will become the most efficient means to sell books.