Despite using drones, sniffer dogs and thermal cameras, the rescue team searched the mountainous area ______ for three days, examining every possible location for signs of the missing hikers.
extensively
The police interviewed dozens of witnesses and examined hours of CCTV footage, but they still couldn't establish what had happened to the missing journalist. All their efforts were ______.
to no avail
When smoke began pouring out of the office kitchen, an employee immediately ______, alerting everyone in the building to the danger and prompting an evacuation.
sounded the alarm
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