How to Use "unannounced" with Example Sentences

1. Show up on your doorstep unannounced ?
2. Just two days after haiti 's earthquake , leonel fernandez , the president of the neighbouring dominican republic , ordered a helicopter to fly him over the border for an unannounced visit .
3. Does he want you to swing by unannounced , make an appointment , send an e-mail or call first ?
4. Mr kikwete turns up unannounced at state-owned outfits such as the port and the railways to demand efficiency and rail against corruption .
5. It is unclear what caused mr. saleh to fly unannounced to riyadh to finalize the agreement in front of yemeni opposition leaders , officials from the gulf states and several western allies and an envoy from the united nations .