One key to cleaning the _________of your camera is not to touch it with your fingers. 

The film was the first to show conditions in which poor people lived and as such was to _______future directors. 

It was dark and cold. At one moment he thought that he ___ his way.

In the past, land travels _____ very long and they _____ very tiring.

They _____ the whole building by the time the fire _____ to all the floors.

When we _____ again, Steve and I _____ each other for more than fifteen years.