There are 5 mistakes in the passage below. Write out the mistakes and correct them.
In 1783, two French brothers built the first balloon to take people into the air. One hundred and twenty years lately, in 1903, the Wright brothers built the first plane with an engine and flew in it. This was in the United States. Then, in 1918, the US Post Office begun the first airmail service. Aeroplanes changed a much in the next thirty years. Then, in 1950s, aeroplanes became much faster because they had jet engines. In 1976, Concorde was build in the UK and France. It is the fastest passenger plane in the world and it can fly at 2500 kilometers an hour, so the journey in London to New York is only four hours. Today millions of people travel on aeroplane, and it is difficult to think of a world without them.
Trả lời câu hỏi dưới đây:
Aeroplanes changed a much in the next thirty years.
=> lot