28. His mother doesn’t ______ of her going to study in the United States alone.
A. allow B. agree C. prove D. approve
29. — Hello, Jim! May I ask you a question?
A. No, thanks B. Right
C. Never mind D. Certainly
30. I _______ any job I like since I came to this city.
A. haven’t done B. don’t do C. wouldn’t do D. didn’t do