New Words：

sudden [ˈsʌdn] adj. 突然的；忽然的；突如其来的
suddenly [ˈsʌdənli] adv.突然;忽然

Sample Sentences：

His death was very sudden.
You frightened me with that sudden noise.

It all happened so suddenly.
Suddenly a football hit him on his head.
You walk on and on. Trying to find your way out. Suddenly you see a castle.

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