Fill in the verbs into the correct passive form. I think the photographer should ______ an award for his stunning wildlife images.

The sentence requires a passive construction after "should". The subject "photographer" is receiving the award, not giving it. Therefore, the passive form "have been given" is appropriate. The structure "should + have + been + past participle" is used for past modals expressing obligation or expectation. The sentence implies an expectation that the photographer should receive an award.

Answer: have been given