Ⅱ、单项选择（20分）
（ ）21. did you go last summer vacation?
I went to summer camp.
A. What B. Where C. How D. When
（ ）22. She looks very sad. What should I do to make her ?
A. happy B. happily C. to happy D. to be happy
（ ）23. Australia is famous koalas and kangaroos.
A. at B. on C. for D. with
