I had to switch off the radio. 
Tôi đã phải tắt đài. * 084 like: das Radio → →
das Radio ☊ đài ☊ 
☊ Lass uns doch das Radio einschalten oder im Internet nach mehr Informationen suchen. ☊ Chúng ta hãy bật đài hoặc lên mạng tìm kiếm thêm thông tin. ☊ (Lektion 72, Nr. 1039) The play was written specially for radio. ☊ radio ☊
I listen to the radio on the way to work. ☊ radio ☊
He smashed the radio to pieces. ☊ smash ☊
The radio was tuned (in) to the BBC World Service. ☊ tune ☊