Answer:
literal substitute 01- nonstop
literal substitute 02- perpetually
literal substitute 03- 24/7
literal substitute 04- constantly
literal substitute 05- all the time
Explanation:
"around the clock" is a phrase that is used to describe someone or something that is working all day long
The emergency telephone lines operate around the clock.
literal substitute 01- the emergency lines operate nonstop.
literal substitute 02- the emergency lines operate perpetually.
literal substitute 03- the emergency lines operate 24/7.
literal substitute 04- the emergency lines operate constantly.
literal substitute 05- the emergency lines operate all the time.