When we arrived the cinema, the movie ____________ for 20 minutes.A. had started B had been on C. started D. is on
________from heart trouble for years, Professor White has to take some medicine with him wherever he goes.
________, the boy couldn't enter his house.
Time________, I can have done it better.
_______the exam, the boy was punished by his father.
________hard before, Tom is afraid of failing in the exam.