car/door/house keys
I left my keys at your house. (Key English Test; A2; Slovak)
You can check your answers in the answer key on page 176.
Hard work is the key to success.
To those who say that money can't buy happiness I answer that money is a key to happiness. (First Certificate in English; B2; French)
Press the shift key to write in capital letters.
piano keys
What is more, you can get the information you need in just one second by pressing the "enter" key [o]n a computer. (First Certificate in English; B2; Spanish)
She was a key figure in the international art world.
a key factor in tackling the problem
Unfortunately one day I decided that it was time to become more independent and I didn't ask a key question. (First Certificate in English; B2; Polish)
Early diagnosis is key to your chances of surviving.
Distribution is key to achiev[ing] economic growth and the positioning of domestic and imported goods. (International English Language Testing System; C1; Spanish)