The couple __________.I really don’t know why.
The sales boy thought he could persuade the boss of the company _____ buying some e-books.
I haven’t seen you for a couple of days. What have you been up _____?
_____ the mountain flood, the old woman insisted _____ remaining in her house.
The wounded soldiers were _____ danger, because we had run _____ medicine.
The workers and technicians worked hard _____ to get the Great Hall finished before National Day.