Many people like white color as it is a ________ of purity.

There are certain _______when you have to interrupt people who are in the middle of doing something.

People are using more and more natural gas, wind and other forms of _____.

— Oh,you haven’t read my e-mail?—Sorry,I haven’t had any____ to the computer these days. 

On the top of Mount Tai，you can get a wonderful________of the sunrise.