警方呼吁事故目击者站出来。

The police are appealing for a ___witness to the accident to come forward.

据目击者称，抢劫是由两名青少年实施的。

According to the ___witness, the robbery was committed by two teenagers.

她是刑事审判中的关键目击者。

She was the key ___witness in the criminal trial.