1. a piece of cake
The exam was a piece of cake, I expected it to be a lot harder.
All the idioms are a piece of cake for those people with good memory.
This exercise was a piece of cake I need something more challaging.
Climbing that mountain was a piece of cake. No problem at all.
Don't worry about the exam. It'll be a piece of cake.
It's a piece of cake.
The exam was a piece of cake.
Learning English is a piece of cake!
2. horse and buggy
Inglese parola "coś łatwego"(horse and buggy) si verifica in set:
kolosik z silników3. it's not rocket science