Entering the room, they found that quantities of novels _________ on the desk, while a pile of illegal drugs were burned to _________ ground.
These instructions should be made more ___________ , so that the primary school students can understand it.
--- How long have you ___________? --- It’s about ten years since we ___________.
--- Who is the man ___________here? --- Mr. Black.
The stranger stopped and turned around ___________to see is someone was following him.
Where is it___________you picked up the wallet yesterday ?