Alphabet Test Questions

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
a _ bc _ a _ bcdabc _ da _ cd _

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series:

FED , IHG , LKJ , ONM, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
Morning, Afternoon, Evening, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

DM, EN, FO, ?

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

CAT , DBT , ECT , ?

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Biological

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

XX, XOX, XXXX, XXOXX, XXXXXX, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

HI, MN, RS, ?