I. 单项填空。（20分）
1. She is a singer ________?
A. doesn’t she B. hasn’t she C. isn’t he D. don’t he
2. Mary got a birthday present, _______?
A. doesn’t she B. didn’t she C. don’t she D. hasn’t she
3. ----She doesn’t work hard, does she? ----Yes, she _______.
A. does B. is C. was D. doesn’t
