Exercise 4. Rewrite the following text using Passive instead of Active. Some people saw a UFO in the sky above London

A UFO was seen in the sky above London be some people last night. It was reported to the police by them. A helicopter was sent by the army to look at it more closely. The helicopter was shot down by the UFO and both men in it were killed. The police have been given the photographs of the UFO by people. They are looked at now by experts.