Prepositions of time

We usually finish work early __________ Thursdays.

__________ the time you get this letter, I shall be in New York.

He wrote this article __________ his holiday.

She won't hand over the parcel __________ we pay her.

The children aren't here __________ the moment, but they'll be back __________ a few minutes.

Can you come to coffee with us __________ next Saturday?

I want to be at the cinema early so that we're __________ time to get good seats.

Please don't touch anything __________ the detective arrives.

I should be free by 4 p. m. If the conference doesn't end __________ time, I shall have to make my apologies and leave.

He was reluctant to help us at first, but __________ the end he agreed to do what he could.