I can’t quite remember ________ I was taken to Beijing.
It is pretty well understood controls the flow of carbon dioxide in and out the atmosphere today.
It was not until the beginning of the meeting he realized _ I told him was the only possible way to deal with the problem.
--- We haven’t been to the Great Wall for ages.--- No, I don’t remember how many years ago I last visited it.
Mr. Johnson, I’m terribly sorry to you, but there’s someone waiting outside to see you.
In the fairy tale, the beautiful girl was turned by into a swan, which surprised the people present.