IN or AT?

IN or AT 2

Choose the option you think is correct

There is a trial period of three months, __________ the end of which you will be told if you have got the job.
IN
AT
__________ the end of the summer holidays, the children start at their new school.
IN
AT
__________ the end of some very tough negotiations, we managed to get quite a satisfactory deal.
AT
IN
I was going to buy it but, __________ the end, I decided it was simply too expensive.
AT
IN
Jane and I couldn't decide where to go on holiday. __________ the end of a very long discussion, we finally managed to agree on the north of Italy.
AT
IN
I was considering opening a franchise business but, __________ the end, I decided it would be better to open my own business where I could do things exactly as I wanted to.
IN
AT
We are still considering our options __________ present.
IN
AT
It'll take __________ least three weeks to finish this translation.
AT
IN
It'll take __________ most three weeks to finish this translation.
AT
IN
It's worth $500 __________ best.
AT
IN