... with an engine and flied in it This was in the United States Then, in 19 18, the US Post Office began the first airmail service Aeroplanes changed a lot in the next thirty years Then, in 1950s, ... There are four mistakes in the following paragraph Underline the mistakes and correct (2 pts) In 1 783 , two French brothers build the first balloon to take people into the air One hundred and twenty ... 3 This is a place where you can see objects of artistic, cultural, historical, or scientific ...