1.
a) Sound system, cd player, colour television, desktop computer, laptop cumputer, fax, answer machine
b) Portable radio, cd player, radio alarm, personal stereo, video camera, mobile phone, video recorder
c) cd player
2. Sound system, cd player, portable radio, colour television, desktop computer, laptop computer, radio alarm, personal stereo, video camera, mobil phone, video recorder
3. Mobile phone, colour television, laptop computer, desktop computer
4. Phone mobile, colour television, desktop computer, laptop computer, video recorder, video camera.
5. Fax, mobile phone, answer machine, laptop computer, desktop computer
