Условие:
Choose the correct item.
1. The arrival of the jet engine changed/has changed aircraft design.
2. Aviation changed/has changed dramatically with the arrival of new technologies.
3. On April 12, 1961, Yuri Gagarin shouted/has shouted his famous 'Poyekhali!' ('Let's
go!') from the seat of Vostok 1 and became/has become the first man to orbit the Earth.
4. A new generation of aircraft became/has become more economical, environmentally
acceptable and socially beneficial.
5. Aviation specialists rose/have risen a question about the development of space tourism industry.
6. The historic conference held at ICAO headquarters in February 2002 rose/has risen
a question about strengthening aviation security.
7. Pilatre de Rozier travelled/has travelled 24 meters aloft in a Montgolfier balloon in
1783.
8. My chief travelled/has travelled around the world.
9. Aviation became/has become a leading tool in the economic growth of the nations of the world.
10. Alexei Leonov became/has become the first spacewalker.