求一篇首字母填空!
Mark was twelve years old.He was a good boy.But he couldn't see a_________.With the help of his father,he could swim and boat very well.O___________ a fine day,Mark went our for boating .He heard a shout.He couldn't see,b__________ he jumped into his little boat quickly and boated to the sound.It was a young woman.She was having hard swimming in the deep w_________.He was saving her o_________ of water.The woman was OK.Everybody knew Mark well a__________ he was ginven a reward of 1,000 dallars.