Complete the senteces with the past simple or past continuous form of the verbs.
1. A helicopter _________ the people before the boat ______. (rescue/explode)
2. The firefighters _________ the building uitil they __________ the fire ________. (not / enter/put out)
3. The fire alarm ________ them ________ when the firefighters ___________. (wake up/arrive)
Ma puteți ajuta, va rog! ​