What are common adverbs in classical Chinese?
'As far as i know, adverbs in classical chinese are put right in front of the verb', 

As far as my knowledge, it's not the case. In classical lecture of Chinese, the position of adverb are very flexible. There is some pattern, but still, very flexible.

The trick in classical lecture: there are many order-reverse cases depending on such as what would be addressed more. It makes it hard to understand before you get used to it.