What Comes Next: HI, DI, DO, TH MO , ?, ?, ?, ?

Look at the series and guess the next letters.

What Comes Next in the sequence?

HI, DI, DO, TH MO , ?, ?, ?, ?

1. HR, MG, DI, SO
2. AB, GU, MO, KR
3. RA, UP, TH, CL
4. NO, AR, DI, PU

Give reasons for your choice.

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