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Please help me solve the following:

7=C on an E (Newly introduced)
24=BF (2B seen)
24=HCC to S (Working over Christmas)
17=NRBT and G (There is a song about it)
5=WS on CA (Look up)

Any help would be gratefully appreciated!

7 continents on Earth ??

Many thanks Sudokulover for your prompt reply!
But, it says "7=C on an E" in the quiz.
I am at a loss to know what it is!