Fill in the correct preposition: apart, out, behind

1. I want to buy a new bag. My old one is falling .
2. It’s sad when you fall with friends.
3. He fell in Russian, so he had a few private lessons to catch up.
4. He stayed in hospital for 2 weeks, so he fell with his lessons.
5. I want to buy a new car. My old car is falling .

Отметь как лучший,буду благодарен!

1)I want to buy a new bag. My old one is falling apart.

2)It’s sad when you fall  out with friends.

3)He fell  apart in Russian, so he had a few private lessons to catch up.

4)He stayed in hospital for 2 weeks, so he fell behind with his lessons.

5)I want to buy a new car. My old car is falling out.

Объяснение: