At 9 feet tall and weighing about 250 pounds, the ostrich (鸵鸟) is the world’s largest bird. As the myth goes, a frightened ostrich will bury its head in the sand     1     (make) itself invisible to its hunters. If that sounds like a “bird-brained” way to escape danger, you’re right! Actually, the ostrich plays dead in this way. When this behavior     2     (see) from a distance, the ostrich’s head might not be visible,     3     (give) the false impression that its head is buried.

    1     Old Tom and the other killers were fierce hunters, they never harmed or attacked people. In fact, they protected them. There was one day when we were out in the bay during a hunt and James was washed off the boat. “Man overboard！Turn the boat around！” urged George,     2     (shout) loudly.

The sea was rough that day and it was difficult to handle the boat. The waves were carrying James further and further away from us. From James’s face, I could see he was     3     (terrify) of being abandoned by us. Then suddenly I saw a shark. “Look, there’s a shark out there，” I screamed.“Don’t worry, Old Tom won’t let it near，”Red replied. It took over half an hour to get the boat back to James, and when we approached him, I saw James being     4     (firm) held up in the water by Old Tom. I couldn’t believe my eyes.