Stuck on these 3 questions

[kaj]

Really confused about these ones:

A. Soldier you eat with?

m_ _ _ m _ t _     **I thought it was marmite at first, but that doesn't fit.  Anyone know what this is? (8 letters)

 

B. Wrote off (a wasting asset)?

a_ o _ t _ _ _ d  (9 letters)

 

C. Carrying along with ebb and flow?

t _ d _ n _    (6 letters)   Something to do with the word "tide"?

 

Can anyone help with any of the above? Thanks a lot for your help (both now and earlier).  Much appreciated.

[Basle6]

a) messmate

b)tiding

c) amortised

[kaj]

Thank you very much Basle6.