After midnight it began pouring down.Suddenly£¬by the light of the lightning£¬we saw 1.____ steamboat in the middle of the river£¬and we were sailing straight towards it.Jim and I boarded that sinking ship,2._____ (think) that we might find something useful on the boat.3.____our astonishment£¬we saw a light and some people in a cabin.Jim was too frightened to go on but I felt curious£¬wondering 4.