I visited Mr. Johnson during his stay in Shanghai he attended a most important conference there.

As a scientist, Madam Curie devoted herself ________ to her research and that was why she was given two Nobel Prizes

They only stood there with their arms ______in front of their chest rather than give us a hand.

From the date________on the coin, we knew that it was made 500 years ago [ ]

Here comes the bus. Let’s ________.