What are the correct prepositions to use in the given sentences?

Here is the solution for each sentence: 1. I booked my holidays **in** advance this year. 2. Hotels offer special rates if you book **in** advance. 3. Please send me the information **on** a delay. 4. They spent a week **at** the seaside last summer. 5. There are many bikes **for** hire in Helsinki. 6. I've been saving a bit of money all year **for** my holidays. 7. We had to get up early **in** the morning to catch the holidays' board.