26) She is ..... good girl.
Explanation: An indefinite article is used with a noun complement.
27) Peter is .... Japanese.
Explanation: An indefinite article 'a or an' is used before phrases of nationality.
28) Maria likes ..... flowers very much.
Explanation: We are talking about flowers in general, so a definite article is not required.
29) I want ...... flowers in your garden.
Explanation: We are talking about particular flowers. So, definite article 'the' is required.
30) I will come to you on ..... Wednesday.
Explanation: An article is not required with the day of the week.