Mixed idioms

I honestly wouldn't trust either of them. They both think the same way and they're two of a ......

The branch of the American military concerned with warfare at sea is called the ......

I love going up in planes because I like to look down and get a(n) ..... eye view of the area below.

Alex had lost a lot of money and as a consequence was feeling down in the dumps.

The older generation always maintains that in their day things were better and nowadays the country is going to the dogs.

There is no need to apologize about your remarks as I can assure you it's like water off a duck's back to me.

They were very lucky they didn't get themselves killed because they came within a hair's breadth of falling down the mountain.

Then of course there is that huge crack in one of the outer walls, that'll cost you an arm and a leg to repair.

They're not getting away with it! They must pay for what they have done.

Unfortunately he breaks into a cold sweat when he sees her, can't think straight and doesn't know what to do.