Gapped Sentences

Think of one word only which can be used appropriately in all three sentences:

I)

1- We stayed in a fancy hotel in the ______________ of the city.

2- Phillip has learnt all the important dates by ____________ and is very confident about his History test.

3- Paul didn't have the ___________ to tell his children the party had been called off.

II)

1- I can lend you the money on ______________ that I get paid back at the end of the week.

2- The first __________________ in the contract is to work one Saturday every month.

3- The house was in superb ______________ and it was worth a great deal of money.