51. Don’t put your cell (手机) _____ the edge of the table, or it will fall off
On his way to the airport,it ________him all of a sudden that he had forgotten his passport.
Lucy has ________all of the goals she set for herself in high school and is ready for new challenges at university.
He failed the midterm examination and only then ________how much time he had wasted.
Although the teacher didn’t mention any names,everybody knew who he was ________.
The person who was taking photos asked the family to sit ________and listen ________to his order.