1) Chatbots ___________ on the internet for many years a) have existed b) have been existing 2) By 2017, over 30,000 chatbots ___________ by over 100 million people a) had used b) had been used 3) The earliest chatbots ________ for fun by programmers with no commercial plans a) were developed b) developed 4) The responses of chatbots ________ on the conversations of millions of people a) base b) are based 5) Today thousand of companies __________ them to give advice a) use b) are used

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