Nothing _____ after the terrible fire caused by the careless doorkeeper.[ ]

The Belt and Road is a new force of promoting the development of the world economy, that will further push China’s opening-up.

Life is changeable. No one knows what _______ happen in the future.

If you watch carefully, you can see ________ the man does the trick with the cards.

The classroom is ____ clean ____ it was yesterday.— Sorry, I forget to clean it.