1. After a brief introduction, the headmaster went on to give / giving a review of the past term.

2. He went on to talk / talking for half an hour.

3. Since the weather was fine, we decided to have / having a picnic.

4. We stopped to eat / eating by a stream.

5. We stopped to eat / eating when the best man stood up to make a toast.

6. I had always thought that I would enjoy to work / working as a school teacher.

7. l would like to buy / buying this scarf. Would you mind to wrap / wrapping it up as it’s a present for someone.

8. Imagine to be / being offered a job in Hawaii!

9. I have been putting off to go / going to the dentist's for a whole year.

10. I've always disliked to have / having to commute to work.

11. It's worth [ to consider / considering ]  [ to go / going ] to an Australian university.