Professor Hawking stepped into the office he knew that there was no hope.
If we work hard with a strong will, we __________ overcome any difficulty,__________ great it is.
The little boy won't go to sleep __________ his mother tells him a story.
I don't believe we've met before,__________ I must say you do look familiar.
It was a nice meal,__________ a little expensive.
__________ all of them are strong candidates, only one will be chosen for the post.