С. : fill in a, an or the where necessary.1) the local community of collingwood in 2) … sydney is abuzz with news of 3) … unusual humming sound coming from 4) … preston park. 5) … sound was first noticed by 6) … group of children who were playing 7) … football at 8) … park. as one of 9) … children said: "it was 10) … strangest thing i've ever heard, it sounded like someone humming 11) … song really, really loudly." later in the same week, more visitors to 12) … park heard 13) … mysterious sound. eventually, the police was called upon to investigate 14) … matter. by now, the strange hum had become extremely loud and could be heard all over 15) … area. "sometimes it's worse at 16) … night, 'said mrs jacobs, 17) … local resident. later in 18) … … week, 19) … … team of scientists will come to collingwood in 20) … effort to solve 21) … mystery of the humming noise.
