A group of police officers surround peaceful protesters.
A group of police officers are surrounded.
A group of kids are at the park.
A group of people jump for a photograph.
It's important that auditors do not audit work of their own if the  work is material to the purpose of the audit.
$17 per hour in comparison to 10HK per hour.
They are eating strawberries on the farm
The dinosaur is in a stream.
It's not within my knowledge.