If oil______on the frozen north coast in the 1960s, an 800-mile pipeline would not have be

If an incorrect entry were made in the Oil Record Book, you should _____.A.erase the entry

If oil density were greater than water’s, the oil separator _____.A.did workB.would work w

The attack on Fort Sumter near Charleston ______ a sharp response from the North, which le

It is reported that Latin American customers talk ______ on the phone as people in North A

If you pour oil on water, it_________float. A. shall B. will C. can D. may

The original inhabitants on the North American Continent were the______.A．EskimosB．Aborigi