Find the next two terms in the series

J, L, O, S, ?, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series. GJT, IMR, KPP, MSN, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. AB, GH, MN, ST, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. BD, HJ, NP, ?

How many such pairs of letters are there in the word REGIONAL, each of which has as many letters between them in the word (in both forward and backward directions) as they have between them in the English alphabetical series ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series. CX, EV, GT, IR, ?

From the given alternative words, select the word which cannot be formed using the letters of the given word. SPECULATION

A series is given,with one term missing. Choose the correct alternative from the given ones that will complete the series. CAR, GCO, KEL, OGI, ?

What will be the next set of alphabets in the series? PBA, QCB, RDC, SED, ___