The heterogeneity of delivery costs is driven by differences in volume, geographical characteristics and quality of delivery service.
The difference of cost depends on differences in volume, location and service quality.
The difference in cost depends upon the volume only.
This is a problem we have had before.
The man is clean shaven
Dave's mind was racing, and he couldn't take it all at once.
Many national heroes and important figures are between here.
A crowd of students running down a mountain.
People are frowning in tattered clothing.