1.Humans have been living on Earth for about 100.000 years (h).
2.People have been travelling in space since 1961 (f).
3.People have driving cars for about 1900 (d).
4.Madonna have been making records since 1982 (g).
5.Leonadro DiCaprio have been working as an actor since he was five (i).
6.People have been writing for about 5000 years (b).
7.People have been riding bicycles since 1790 (a).
8.I have been doing this exercise for about five minutes (e).
