ركن السؤال و الأجابة 2

[سوبر ناتشرل]

complete
2- Door phones are fitted at the entrance doors of many blocks........flats.Door phones...............the person inside the flat to..................to the caller outside the door of your flat. Only what you need to do is to press a button then , the person inside the flat.........hear you, can let you in. Thanks to..............inventions which.........everything easy for us.