Only after the teacher explained it to me a second time _____ the question.
A. did I understand B. I had understood
C. had I understood D. I did understand
One summer night in 1990, a reporter appeared at the door of Thomas Edison’s laboratory, _____ for an interview.
A. asked B. having asked
C. being asked D. Asking
--- Is Tom still smoking?
--- No. By next Saturday he _____ for a whole month without smoking
A. will have gone B. will have been
C. will go D. has been going
The traditional goal of science is to discover how things are, not how they ought _____.
A. to be B. be C. have been D. To
In their spare time, they will discuss the _____ to the study of English.
A. means B. approaches
C. methods D. Ways
About _____ of the population of that country _____ on farms.
A. Two third; live B. Two third; lives
C. Two thirds; lives D. Two thirds; live
