English brain teaser (don't answer jokes in English)

Two hot dogs,

Three piano keys,

When you ride a horse,

5 teapot

Because the cold is accompanied by the old man (holding an old man)

Coke, tea and wine

8 water,

9 when it's blue, (pornography, it should be called dirty books)

10 Birds can't walk.

1 1 sunny (or sunshade)

12 they all have an "s"

13 age