改错：Yesterday afternoon John and I were walking along a road where we heard someone shout "Help! Help!"

Yesterday afternoon John and I were walking along a road where we heard someone shout "Help! Help!" He was in __1__a lake, about a hundred feet from the shore. There was a __2__small boat nearby. We knew immediately what happened. __3__

He had fallen out of the boat and could not swim good enough __4__to reach it or to get to the shore. As we ran towards the lake I saw him sunk, and I was certain that he would drown. But in __5__a moment his head appeared again. Quickly John took out his __6__shoes, jumped into the water and started swimming toward the drowned man. He reached him just as the man went down __7__again. He was close enough as to stretch out his hand and try __8__to take hold of the man's clothes or his hair before he sank.But the man threw out his arms in fear, caught John across the __9__neck, and began to draw him down under the water. John fought to keep his head above the water and at the same time tried to swim toward the boat, pulled the man with him. __10__