1.Choose the word whose main stress is placed differently from the others in each group: A)solution B)atmosphere C)perfection D)departure 2.Choose the word whose main stress is placed differently from the others in each group: A)present B)future C)perfect D)prefer 3.Choose the word whose main stress is placed differently from the others in each group: A)windy B)nation C)tissue D)repeat 4.Select the synonym of the following bold and underlined word in each sentence in the unit: Drug trafficking is a matter of considerable concern for the entire international community. A)surrounding B)public C)people D)neighborhood PLEASE!I help you....(Thanks you...)^^