1.  A jewellery box had gone missing.

2.  A team of special investigators have gone to the scene of the explosion.

3.  A warning has gone out about a new virus that could wipe everything off your hard disk.

4.  After she had left the office, Wyatt sat and listened to the ventilator go on and off.

5.  After they had deposited their bags at the hotel, itself ramshackle and run-down, they had gone on to the hospital.