Outer space_____(not explore)by people before 1957

Outer space_____(not explore)by people before 1957
Computer science_____(teach)now almost in all uniersities and institutes
The first railway in the world_____(design)in the last century
Five units of this textbook_____(study0 by the end of last month
Visitos___(request)not to touch the exhibits
The meeting is to___(put off)till Friday
A beautiful horse _____(draw)by john the next day