Complete the following series.
xy _ z _ xxyx _ px _ yxzpx _ yxzpx

Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.
CEGI: AGEK:: DFHJ:?

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
_sr_tr_srs_r_srst_

In which odd the following Pairs.

If the above alphabet are divided into two equal halves from A to M and N to Z, which letter in the later half would be corresponding to the letter J? 

If the following five words are arranged in alphabetical order, which word will come in the middle?

ABC, FGH, LMN, ____