What this sentence means " I want to cry"??

In the following sentence identify the words of the subordinate clause and name its type. we believe that christianity is the key to a better world.

Iopened the door quietly,then stood in the doorway rewrite using ..ing participle

What task did the surveyors do? a. they studied the landscape to determine the most direct route for building a road. b. they designed treadmills that lifted blocks of stone to where they were needed. c. they dug trenches and filled them with sand, concrete, and large blocks to form a road.