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Life without computers (seems/ has seemed) simply impossible now.
seems
Computers (affected/ have affected) every aspect of our lives
have affected
Since the time computers (were/ have been) invented, they (encouraged/ have encouraged) great progress in different fields
were- have encouraged
Along with computers, the Internet (aids/ has aided) the developments in technology
has aided
However, many people argue that computers (killed/ have killed) physical contact between people.
have killed
For example, teenagers now (prefer/ have preferred) chatting on the computer to meeting face to face.
prefer
