13. Dr. Martin Cooper invented the first mobile phone in 1973. The first mobile phone . 14. We first used the Internet in 1969. The Internet . 15. Peter Cooper made the first driverless plane in 1917. The first driverless ... 16. Doctor Zhang Jixian found Corona viruses in Wuhan in 2019. Corona viruses .. 17. They repaired the engine of the car when they came home. The engine of ... 18. They provided the Covid patients with free food and drinks. The Covid patients ... 19. A teacher of English installed an air-conditioner for a class in this primary school. An air-conditioner . 20. Billionaire Pham Nhat Vuong founded Vinfast Automobile Company in 2017 . Vinfast Automobile Company ... 21. Theyrepainted thegateofthehouselastweek. The gate ..