Choosing the Correct Form of Be, Have, or Do - Question 3
The Center for Devices and Radiological Health, a unit of the U.S. Food and Drug Administration, (has / have) responsibility for regulating microwave oven safety.
Choosing the Correct Form of Be, Have, or Do - Question 4
According to the Center, the allowed amount of leakage from each microwave oven that reaches the market (am / is / are) far below the level of radiation that is harmful to humans.