Hi Chanjong, thank you for doing and submitting your homework.

>> We use article " The " when the noun is specific or particular.

1.White house is big.
Correct: The white house is big.

2.capitol wihte.
Correct: The Capitol is color white.

3.I don't know. ( monument )
Correct: The Washington Monument honors George Washington.
>> Monument is a structure or building that is built to honour a special person or event.