18 When the storm started, they ________ in a cave. 19 As the tornado moved through the town, high winds ________ across the streets. 20 The police had to ________ to public shelters before the volcano started to erupt. 21 Emergency workers ________ the village when the river flooded the area. 22 Rescue workers are still trying to ________ the forest fires. 23 The strong winds forced the climbers to ________ shelter.