But professors at big schools say there is not enough time to write evaluations for each student in large classes.

VOA: special.2009.03.05

The Obama administration has been especially attuned to criticism that it is not doing enough for small business, and focusing too much on helping big corporations and financial firms.

VOA: standard.2009.03.16

Today,the number is still 40 percent. Part of the problem is that a number of big importers, such as China and Japan, are not doing enough to stop the import and sale of illegal timber.

VOA: standard.2010.07.28