1. The company plans to ______ its old system with a modern one., maintain, convert, persist, 2. New inventions bring ______ to society., decay, distortation, innovation, 3. He couldn’t ______ the pain for a long time., endure, refine, upload, 4. This machine is very ______ and difficult to use., primitive, complex, annual, 5. You should ______ your computer before installing new software., mix up, back up, fade way, 6. The weather tends to ______ between hot and cold in spring., alternate, persist, distort, 7. Scientists are trying to ______ the quality of this product., decay, refine, spoil, Please ______ your password to log in., mix up, key in, take apart, After many years, the old building began to ______., spoil, worn out, detiorate, The internet allows us to ______ files quickly., convert, upload, endure, . He decided to ______ his old jacket by fixing the buttons., do up, mix apart, take apart, This instruction is in ______ form, not digital., online, network, mannual, The company made a major technological ______ last year., breakthrough, decay, upload, Please ______ the lights before leaving the room., mix up, switch off, refine, Don’t ______ these two documents. They are different., take appart, mix up, remain

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