The group’s research has done much to our knowledge of the HIV virus.
--Hello, I’d like to talk to Mr. Wang.--______, please. He’ll be here in a moment.
Though _____ failure is the mother of success, everyone wishes to have ______ success.
The teacher went for further study and he said he was ______ to come back the next week.
Roylott was sitting on a chair, with his eyes ______ the window.
--Mum, I can’t do the washing on my own. It’s too difficult.--All right. I ______ you with it.