When the author states that “proven reserves have dried up” he means that these reserves have: 
The main idea implied in the final sentence is that: 
The word “force” in “the speed, force, and depth of a drill,” is to “forceful” as: 
Indeed in “Indeed …it remains a hands-on industry.” introduces a(n): 
The information presented in the title is: 
The opposite of “deep” in “very deep water” is: 
The verb phrase in “have yielded” is in the: 
The underlined word in “nearly 40,000…..” means the same as: 
“as” in “as development proceeds” is used in the same way as in: 
The first sentence of the text implies that paper: 