Choose the correct particle: 1. Our car has suddenly broken up/down.
2. A burglar broke into/out the supermarket by night.
3. Hewas a little kid when the war broke out/into.
4. The girls were adopted and brought in/up by her aunt.
5. He was brought around about to tell the truth.

1. Our car has suddenly broken down.
Explanation: "Break down" means to stop working or functioning properly. In this context, it means that the car suddenly stopped working.

2. A burglar broke into the supermarket by night.
Explanation: "Break into" means to enter a building unlawfully or forcefully. In this context, it means that the burglar entered the supermarket without permission.

3. He was a little kid when the war broke out.
Explanation: "Break out" means to start suddenly or unexpectedly. In this context, it means that the war started suddenly.

4. The girls were adopted and brought up by her aunt.
Explanation: "Bring up" means to raise or educate someone. In this context, it means that the aunt raised and took care of the girls.

5. He was brought around to tell the truth.
Explanation: This sentence is not grammatically correct. The correct phrase should be "He was brought around to tell the truth." However, the meaning of "brought around" is not clear in this context. We would need more information to give a precise explanation.