—I see you got a "D" in biology._ ?—Well, I found that subject hard. I think I'II drop it for history.
My sister, ______ for months to find a job as a teacher, finally took a position in Wenzhou Daily.
The report was not concrete and in a way lacked persuasion, but ______, I felt it is fair.
Many things ______ impossible in the past are very common today.
She is believed______ the train, otherwise she would have arrived here by now.
Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.