Complete the sentences with the correct words.

1. I feel terrible. I'm in ... minds about whether or not to go to school today.

2. Oliver's been very confused lately. He has been at sixes and ... .

3. Ray always gives me a hand. He's one in a ... .

4. There are a ... and one reasons why you should go to university.

5. To me, it was six of one and ... a dozen of the other. They were both responsible for what happened.

6. We only received the signatures at the ... hour.