Verbal Reasoning - Mental Ability Questions

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

t_vw_u_w_uvw

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

HOT, GMQ, FKN, EIK, ?

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

Select the odd word/letters/number/number pair from the given alternatives.

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

BEG, DGI, FIK, HKM, ?

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

XT, YU, BX, GC, ?

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

CPI, AME, YJA, WGW, ?

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

?, flight lieutenant, squadron leader, wing commander