The conversation between human and AI assistant.
[|Human|] Select the correct words among the given options to fill the blanks below the sentence:

The great wall of china was build __________ to keep invaders out.
[|AI|] The great wall of china was built formidably to keep invaders out.
[|Human|] 
Select the correct words among the given options to fill the blanks below the sentence:

The great wall of china was build __________ to keep invaders out.