Question

a...underline the silent lettters.

bomb,calf,comb,half,tomb,palm

b...two letters that have no sound in word

fight,fright,light,might,night,right,sight

Answer 1

Bomb - b, calf l, comb-m, tomb-m, palm-m,
Gh has no sound in second question

Answer 2

in a,
bomb-b
calf-l
comb-b
half-l
tomb-b
palm-l

in b, in all 7 words,gh is silent.
These words are will be mainly German words.
Hope this helps you quickly