1) The first smartphone ... in the early 1990s. a) was developed b) is developed 2) Artificial intelligence ... in many industries today. a) was used b) is used 3) A new type of battery ... to improve energy efficiency. a) is being tested b) is been test 4) Many breakthroughs in medicine ... in recent years. a) had been made b) have been made 5) By the time 5G was launched, faster networks .... tested. a) had already been b) had already being tested 6) New robots ... in factories to improve productivity. a) will be introduced b) will being introduced 7) Drones .... for delivering packages in the future. a) can to be used b) can be used  8) Old technology ... with more efficient systems. a) should be replaced b) should to be replaced 9) Electric cars ... to the market decades ago. a) were introduced b) are introduced 10) New apps ... every day to make life easier. a) is created b) are created 11) Self-driving cars ... by several technology companies. a) are being developed b) are been developed 12) Smart home devices ... in millions of houses worldwide. a) have become installed b) have been installed 13) Before electric scooters became popular, they ... for private use. a) had been designed b) have been designed 14) A more advanced AI assistant ... in the next few years. a) is going to be developed b) are going to be developed 15) More eco-friendly materials ... to reduce pollution. a) must be developed b) must to be developed

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