Нужно, заранее use the gerund: 1. i remember (to tell) them about it. 2. do you mind my (to open) the windows? 3. this film is not worth (to see). 4. i object to (to discuss) this question at the meeting. 5. everybody was against (to participate) in the games. 6. the flat needs (to repair).
2) opening
3) seeing
4) discussing
5) participating
6) repairing