In the following series of letters, a definite order determines the sequence. Which of the following options represents the next two letters in the correct order? A J K T U B I L S V C H M R W D G N Q X E F O ? ?

Find the missing group of letters in the given sequence: QAR, RAS, SAT, TAU, ____

In the given series, choose the missing term from the given alternatives: DEF, HIJ, MNO, ?

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. ANZ, BOY, DQW, GTT, ?