阅读下面的对话，并根据对话内容和首字母提示将答案填在横线上。

A：Have you ever heard of the Great Wall？

B：Father told me a lot．It is the longest wall in the world，right？

A：Yes ．Not only the longest，it is also the o        （1）．The Great Wall was built over 2000years ago．

B：How did they build it？

A：Tens of thousands of people were m        （2）to work there．They had to carry big stones up to the top of high mountains，but they could h        （3）have enough to eat．Work was so hard that a great many of them died．

B：What a sad story！Can you tell me how wide it is？

A：It is wide e        （4）for eight people to walk side by side，and seven cars can t        （5）on it．

B：I can see some towers in front．What were they u        （6）for？

A：They are made of strong stones．They once held soldiers who kept w        （7）on the enemy．They were also used to p        （8）the messages from one tower to the next by m        （9）a fire．

B：Oh，how wonderful！

A：Chinese people say that if you f        （10）to reach the Great Wall，you are not a man．Now we are all the true men．

参考答案：

1．oldest 2．made 3．hardly 4．enough 5．travel 6．used 7．watch 8．pass 9．making 10．fail