It’s important _________ us _________ _English well.

Tom was at a loss as to how a car worked, so it was______ that he knew nothing about how to repair cars.

However, at times this balance in nature is disturbed,_____a number of possibly unforeseen effects.[ ]

Two years later, her father disappeared, never to be_________ again.

Could you please tell me_______—Sorry, you can turn to Mr. Lee for help.