1 . It may seem like building ________(n. 城堡) in the air(幻想), but given the rate at which artificial intelligence, or AI, is being developed, in the future such dreams may actually come true.(根据汉语提示单词拼写)

2 . The ancient c________ were made of earth and wood, and they were likely to suffer attacks by fire.(根据首字母单词拼写)

3 . The old ________ (城堡) made of earth and wood dates from Ming Dynasty. （根据汉语提示拼写单词）

4 . The ________(城堡)is set in 25 acres of beautiful grounds with a history of nearly 200 hundred years. （根据汉语提示单词拼写）

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