A/ Select the synonym of the following bold and underlined word in each sentence in the unit: 1/ Can you name the sea animal in each picture? (In the textbook) A. description B. presentation C. scene D. painting 2/ It is divided into five different parts: the Pacific, Atlantic, Indian, Antarctic and Arctic Oceans. A. individual B. dissimilar C. singular D. many 3/ Together, they cover 75% of our Earth. A. spread B. curtain C. comprehend D. report 4/ Today's scientists have overcome many of the challenges of the depth by using more sophisticated tools. A. passed B. run C. flown D. conquered 5/ Today's scientists have overcome many of the challenges of the depth by using more sophisticated tools. A. summons B. dare C. objection D. stimuli 6/ Today's scientists have overcome many of the challenges of the depth by using more sophisticated tools. A. complicated B. worldly C. experienced D. aware 7/ They can send submarines and devices to investigate the ocean depths, taking photographs and samples of animal life to bring back to the surface for further study. A. trace B. explore C. track D. look for 8/ Understanding the interactions of the ocean and marine life gives us an indication of the planet's health and the effects of human activity. A. information B. direction C. contribution D. evidence 9/ Small or oversized, plant or animal, the ocean's living things contribute to its endless variety, its biodiversity. A. start B. send C. give D. throw 10/ How can scientists now reveal the secrets of the ocean and marine life? A. announce B. say C. retell D. report 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 C/ Choose the best answer A, B, C or D for each sentence: 1/ We're reading a _______ book this week. A. differ B. difference C. different D. differently 2/ She gave him a _______ look. "Are you really sure?" she demanded. A. challenge B. challenger C. challenged D. challenging 3/ The article was an excellent piece of _______ journalism. A. investigate B. investigative C. investigation D. investigating 4/ The company needs to reduce its _______ on just one particular product. A. depend B. dependence C. dependable D. dependant 5/ My grandpa's attitudes are very _______, considering his age. A. modern B. modernity C. modernize D. modernization 6/ The sea bed _______ here to 5000 meters. A. deep B. deepens C. deeper D. depth 7/ You've got to try to keep _______ as you grow older. A. act B. active C. action D. actor 8/ He would never do anything to _______ the lives of his children. A. danger B. dangerous C. endanger D. endangered 9/ If the product doesn't work, you are given the _______ of a refund or a replacement. A. choice B. choose C. chooser D. choosing 10/ We saw a quick film showing the various stages in the _______ of glass. A. produce B. producer C. products D. production D/ Supply the correct verb tense, paying careful attention to the tense sequence: 1/ If war (come) _______, the people in the nation will be ready. 2/ If today (be) _______ Sunday, I should not have to go to school. 3/ If we don't study our lessons, we (not have) _______ good marks in the exam. 4/ If he had had her address, he (write) _______ to her. 5/ You (catch) _______ cold if you went out in the rain. 6/ If the weather is fine, we (go) _______ to the mountain. 7/ If he (write) _______ more carefully, he might not have made so many mistakes. 8/ Was she to speak to him like that, he (be) _______ very angry.