I can't manage _____ a good night's sleep if I am to do a good day's work.
Upon reaching an/a ______ age, children are encouraged, but not forced, to “leave the nest”.
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.