Помогите пожалуйсто вставить где нужно артикль

Ответ:

1) This is a tree. The tree is green.

2) I can see a boy. The boy is playing.

3) I have a bicycle. The bycicle is black.

4) We wrote a dictation yesterday. The dictation was long.

5) She has a ball. The ball is big.

6) I got a letter. The letter was from my friend.

7) Pete is the tallest boy in our class.

8) Nick is the shortest boy, but he is very strong