用方框中所给单词的适当形式填空。每词限用一次。

1．Thanks for ______me to your birthday party．

2．The computer is a great  ______ in the 20th century．

3．The sheep is afraid of the wolf．It hides itself ______ a tree．

4．I am still hungry．Can I have ______bowl of noodles?

5．My Australian friend Tony works in China．He goes back to see his parents ______a year．