1 . The original ________(城堡)were made of earth and wood, and they were likely to suffer attacks by fire. (根据汉语提示单词拼写）

2 . He was riding on his horse looking for the ________ (城堡). （根据汉语提示单词拼写）

3 . The original c________ was probably built about AD 860.（根据首字母填空）