4- use used to to complete the sentences

1. play football when he was young.

2. travel by train when she was young?

3. (not/send) emails 100 years ago.

4. they /play) computer games 100 years ago.

5. most people write letters 100 years ago.

1. ...used to...
2. ...Did...use to...
3. ...didn't use to send...
4. ...didn't use to play...
5. ...used to...

What makes them similar is that that both Charrington and O'Brien seem to be on Winston's side, i.e. against the Party. Another similarity is that they both end up betraying him, essentially they deceived him by hiding their true intentions from him. Charrington uses a literal disguise, while O'Brien was just pretending to be something he is not.