Hi guys can you answer all of this English sentences pls

1. They arrived at the Kuala Lumpur International Airport this morning.

2. Jega, Liew, and Syah are going to Langkawi next Sunday.

3. Are you coming with us this Saturday?

4. Where is the secret door you've mentioned earlier?

5. The brown teddy bear is mine while the white one is Sarah's.

6. The library is not open yet, so we waited outside.

7. We buy donuts, cheesecakes, and some shortbread.

8. Is there any milk left in the refrigerator?

9. Maniam and his friends are going to Pegang by bus this Friday.

10. The bell is going to ring, so I quickly finish my food.

11. Where did you put the new books that I've bought this morning?

12. You and I are going represent the school in the storytelling competition.

where is the article