1. They used to provide poor students with free books every month.      Correct

2. Did they get use to the brand new washing machine?       Incorrect. Correction: Did they get used to the brand new washing machine?

3. Raphael used to work until midnight to prepare for his first play?      Correct

4. This famous stadium got used to be an abandoned park.      Incorrect. Correction: This famous stadium used to be an abandoned park.

5. Will they get used to communicate through telegrams?      Incorrect. Correction: Will they get used to communicating through telegrams?