1.   New drugs like Viagra sap the resources of a health care system that is straining to provide basic care.

2.   Serbia, under sanctions for the past three years, will be strained to provide for the refugees.

3.   The problem has been worsened by an unusually dry fall and winter, which has hydroelectric dams straining to provide enough power.

4.   They strain to provide books and professors, laboratories and majors.

5.   They left behind a shrinking tax base straining to provide transportation, police protection, and education and social services.