Answer:
The answer is 'the street lamp sputtered/the street lamp muttered'.
Step-by-step explanation:
Onomatopeias are the imitation of verbal or non verbal sounds made by the subject or object of an utterance. It's literary figure of speech commonly used to express ideas colorfully in poems or dialogues.
Onomatopeia attracts the readers' attention by appealing to their sense of hearing.
In this particular poem, the sputter of a lamp refers to the popping or sizzling sound old street lamps used to make. Its 'mutter' on the other hand, refers to the murmur lamps made at the moment they were lit.