CORRECT: Make sentences using these words.

> Use the plural form, "these words" since there are 5 words  which you have to make sentences with.

1.community- Where is your community? CORRECT!

2.rule- Every school has many rules. CORRECT!

3. flag- Korean flag has four(4)coler.

CORRECT:  flag- South Korea's flag has four (4) colors.

> Use the possessive form, "South Korea's". Possessives are used to indicate ownership.
> Be careful with your spelling.

4.symbol- American famous symbol is Statue of Liberty.

CORRECT:  symbol- One of the USA's famous symbols is the  Statue of Liberty.

> Use "One of the USA's famous symbols..." : The phrase 'one of the' is used to describe something/someone from the same group.
> Use "THE Statue of Liberty": When we are talking about one thing in particular, we use the article "the".

5.special- My special day is birthday!

CORRECT:  The most special day for me is my birthday.

> Use the superlative, "most".  We use a superlative adjective to describe the extreme quality of one thing in a group of things.