1. Humans have been living on Earth for about 100,000 years.
2. People have been traveled in space since 1961.
3. People have been driving cars since 1790.
4. Madonna has been making records since 1982.
5. Leonardo di Caprio has bern working as an actor since he was five.
6. People have been writing for 5,000 years.
7. People have been riding bycicles since 1900.
8. I have done this exercise in about five minutes.
