How to use 主持 in composition
Actually there's a site written by Chinese explained the meaning of "主持". And here it is: http://baike.baidu.com/subview/77617/14131395.htm

Then, there are some points I think I should explain for you:

1. When it comes to Ancient Chinese, the "主持" always means someone handles or deal with things. And at this time, it's a verb. But when we visit a temple, we would call the head-hander "主持" -- now it's a noun.

2. When it comes to Modern Chinese, this word means someone in charge of some things, especially something matters or grand to cater for the solemn atmosphere there. In those occasions you can use it, and others will not feel you choose your words unexpected.


Hope can help :)