It was always raining and the food was terrible ________the holiday was very disappointing[ ]

Mike, where’s today’s newspaper—Well, you don’t need to read it because there is _____in it.

－Did you talk back to your mother when you were a child－Yes. But now I realize I was wrong. I really regret _____ that silly thing to my mum.

I ______ an old letter while I was searching mydrawer.

_ the average age of the population increases, there are more and more old people to care for.