my lab was very active site
This sentence is in passive voice. For active voice, the sentence could be recast as, "Searchers found fragments of animal bones and other refuse at the site."
To change an active sentence to passive, identify the object in the active sentence and make it the subject in the passive sentence. Move the subject of the active sentence to the phrase with "by" and change the verb to its past participle form. To change a passive sentence to active, identify the subject in the passive sentence and make it the subject in the active sentence. Use an appropriate active verb to describe the subject's action and add the original object of the passive sentence as the direct object in the active sentence.
i have found a site to cite
the site of the view is amazing
You would use deem in a sentence like 'I deem this site to be unsafe'
[Some one] washed the car. You need an active subject to use active voice. Who did the washing? That person should be the actor in the sentence.
That sight is very famous
you look on another site
You have to use a microscope to see the radio active fuel
When I arrived at the site, I was amazed at the sight of two bison!
Active site.
This site comes highly recommended.