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A lot of work in the office(1)______ done on laptops. This is because laptops(2)_________ easily carried from the office to the home.Of course,the laptop of today(3)_______ made to be easy to pick up and carry.However, the first laptops(4)________ designed in that way.The first laptop(5)_______ built in 1975 and it was very heavy.In fact, it was the same size as today's regular computer,and it(6)______ used by many people at all