A. How
B. What
C. When
D. Where

1. 没人能回答这个问题，你最好问老师。
    No one can answer this question. ________________.
2. 黄河是我国第二长河。
    The Yellow River is ________________ in our country.
3. 我的手提电脑是去年中国生产的。
    My laptop ________________________________ last year.
4. 继续试试，我们能够想出好主意的。
    Keep trying and we __________________________ a good idea.
5. 你应该告诉你妈妈今晚什么时候回家。
    You should tell your mother when ________________ tonight.

1.谁拆毁了这些古城墙？
Who _______ _______ the old city walls?
2.人们把黄河当作我们中华民族的象征。
People _______ the Yellow River _______ a symbol of the Chinese nation.
3.科学家们发现这个帝王墓破旧不堪了。
Scientists found that the emperor’s tomb was _______ _______.
4.从明天起，人们开始重建家园。
From tomorrow _______, the workers are beginning to _______ their homes.
5.这座桥有六百多年的历史了。
The bridge is _______ _______ 600 years old.