B/ Select the antonym of the following bold and underlined word in each sentence in the unit: 1/ For centuries, people have been challenged by the mysteries that lie beneath the blue depths of the ocean. A. overhead B. top C. over D. high 2/ For centuries, people have been challenged by the mysteries that lie beneath the blue depths of the ocean. A. lengths B. narrowness C. width D. surface 3/ How different a picture we now have of the ocean as the sea has begun to reveal its secrets. A. public B. opening C. knowledge D. schooling 4/ The plants and animals of the sea fall into three major groups. A. small B. tiny C. subordinate D. unnecessary 5/ Use water sparingly and keep water clean. A. many B. few C. well D. plentifully