I’m not absolutely certain, you see, ___________whether I should say it.
A. because of
B. owing to
C. as to
D. sort of
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____________caused the plane crash remains unknown.
A. Why
B. How
C. When
D. What
___________that China has the best and brightest scientists to solve the problems is not just good policy, but something personal.
A. Ensure
B. Ensuring
C. Ensured
D. To ensure
You become more ____________in prison than you had been before, ________ regularly.
A. discipline, study
B. disciplining, studying
C. disciplined, studying
D. disciplining, studied
No country can really develop __________its citizens are educated.
A. if
B. when
C. because
D. unless