根据语境补全句中的单词。
（1）Do you know ________________（为什么）?
（2）It’s an ___________________（请柬）to my birthday party.
（3）You were in China for two __________________（年）.
（4）Now there is a big __________________（操场）.
（5）I don’t have anything to do. I’m _________________（无聊的）.
The Summer Palace is in _______ .
A. Shanghai B .Nanjing C .Beijing
I didn't visit _______ on Friday .
A .the great wall B . the Great Wall C. Great Wall
Our National Day is in _______ .
A .June B. October C .December
Helen often ____ oranges on the farm .
A .picks B .picking C . picked
The Scottish often wear _________ .
A .jeans B. a kilt C. a skirt