CPE gapped sentences

Hi

1. A mobile phone is an absolute……………for this job, as you will need to be available at all times.
2. The summary of his findings is, of…………, very brief, but it gives as much information as is relevant.
3. There was no………………for her to give up her job- it was entirely her own choice.

It should be CALL, I think. Then again, of call in the second sentence I find odd.

comments?

Thanks