Can you explain ________ the sun goes down in the west?
"Who Moved My Cheese?", ____________ is a best-selling book, is written by Spencer Johnson.
—I'd like to have some lunch but I have to stay here doing my work.—___________ what you want and I can get it for you.
— Show me your permit, please. —Oh, it's not in my pocket.It
—Why ! Where's my passport? Maybe I left it on the plane. --My Goodness ! You ____________ things behind.
I tried hard to get some information about the new technology out of his mouth, but he remained_________.