Fill in the gaps. Put the words in the correct place.

Joseph and Jacques Montgolfier are called the ... of hot-air balloons. In 1777 they came to the t ... hat heat had the power to lift things . They performed some experiments trying to th ... is heat inside a balloon to peo ... ple off the ground. 6 years later they thei ... r first hot-air balloon. A huge crowd to wa ... tch the balloon high i ... n the sky. The first were a ... sheep, a duck and a chicken. The animals landed safe and
. Short ... ly afterwards, the first flight with human passengers took place in Paris. The new was a gr ... eat success and started a long tradition of hot-air ballooning.