_______in my life impressed me so deeply as my first visit to the Palace Museum.

I didn’t know which bag was better than the other, so I took them________.

To make room for teachers’ correction, the students had better write their composition _____.

As a journalist, Joan finds _______ worthwhile to spend time chatting with people of different backgrounds and nationalities. 

Some experts are warning that the step the US government has taken to deal with the current crisis between China and Japan is ______ of much risk.