We should _______ the police to undertake a full investigation into the traffic accident, of which the witnesses gave different versions.
---- What’s your brother? ---- He has been _____ the China Daily for years.
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.