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Fill in the blanks with correct verb tense.
Computer is one of great innovations in history. It (1) ____ (be) introduced to the public in the 1980s. Since then, technologies (2) ____ (change) greatly. The first computers (3) ____ (be designed) for basic tasks, only for typing and counting. There (4) ____ (be) no memory in it and, of course, they (5) ____ (be) not efficient. It (6) ____ (consume) a large amount of electricity. Early computers (7) ____ (be) also very costly. That's the reason why only a few people (8) ____ (afford). Times (9) ____ (change). Computers (10) ____ (become) powerful machines with practical and sophisticated applications. People (11) ____ (do) a lot of things with them. The Internet (12) ____ (make) more people dependent on computers. The Internet (13) ____ (enable) people to communicate with others fast. It also (14) ____ (enable) people to know information very fast. Computers and the Internet (15) ____ (lead to) other booming innovations, like the smartphone.
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