A (1)______ of trucks carrying soldiers was coming down the mountain road. The trucks (2) ______ slowly as there had been heavy snowfall in that area . Suddenly, with a (3) ______ a huge tree on the hill side fell bringing along with it boulders and mud. (4) ______, the driver of first truck stopped in time. The soldiers got down and started (5) ______ the road.
Select the most appropriate option for blank no. 4