Choose the correct options

1. Not until [I watched|did I watch|was I watched|watched I] the film did I realise how thought-provoking it was.
2. Seldom [I have got|did I got|am I getting|have I got] such a nice birthday present!
3. No sooner [I had fallen|do I fall|had I fallen|was I falling] asleep than the phone rang.
4. At no time [I didn't think|was I think|I had thought|did I think] that he was the one who had stolen my money.
5. Not only [have I forgotten|are I forgotten|I did forget|have I forgot] my umbrella at the office, I've also missed the last train.
6. Never [did there be|has there been|there was|there has been] a better day in my life than today.
7. Rarely [politicians care|are politicians care|do politicians care|care politicians] about the important things like the education system and social problems to make any changes.
8. Only after finishing her studies [Sarah was allowed|did Sarah allow| was allowed Sarah|was Sarah allowed] to watch her favourite TV series.
9. Little [did mum know|mum did know|was mum know|mum knew] that I had some really good news for her.
10. Only when [is the bell ring|the bell rings|did the bell rang|rings the bell] may students leave the classroom.