1. A plane .... (hijack) yesterday on its way from
London to Athens.
2. The scene of the crime .... (examine) by
detectives.
3. The criminals ..... (not recognise) by their
victims.
4. A lot of damage .... (cause) during the riots.
5. The robbers..... (not give) long prison
sentences.
6. The murderers .... (not identify) because their
faces ..... (hide) by masks.