41.   The U.S. has pledged aid to the country.

42.   The US has threatened to cut off aid to the region.

43.   The US spends billions of dollars on aid to developing countries.

44.   The use of a subject heading is an aid to this.

45.   The use of linear programming as an aid to Decision making when allocating scarce investment funds has been widely advocated.

46.   The work provided the foundation for the vaginal use of gels containing organic mercurial compounds as aids to contraception.

47.   Their aim was to see what incentive effects financial aid to poor families would produce.

48.   There is some basis for this hope, since information technologies are becoming powerful aids to learning and communication.

49.   This scheme launched enterprises with dramatic results, instead of doling out aid to passive clients.

50.   This was a considerable aid to understanding the thinking behind the draft guidance.