I’m afraid I’m not _____to help with the talent show, for I am fully occupied with my own project.

Smoking is one of the ________causes of cancer，killing millions of people each year. 

What made the whole nation sad was that more than 100 miners were buried      in the underground coal mine.

It’s said that in the sea the fisherman caught a big fish ________.

I really appreciate that your help is of great _________.