IELTS Cambridge 16 Test 4: ACADEMIC READING MODULE
Reading Passage 1:Roman tunnels 1. ………………………. to direct the tunneling posts – First paragraph, 3rd line. “They introduced the qanat method of tunnel construction, which consisted of placing posts over a hill in a straight line, to ensure that the tunnel kept to its route.” The meaning of “to ensure that the tunnel kept to its route” …
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